The FM-2 Wildcat safely tucked away in the hangar bay. The Stearman Model 75 can be seen the back (Commemorative Air Force)
The amphibious assault ship USS Essex (LHD-2) is an integral part of the Marine Air-Ground Task Force as a forward operating platform. Essex is capable of carrying up to 1,771 Marines as well as the landing craft to get them ashore.
Her aircraft suite includes AV-8B Harrier II attack aircraft, F-35B Lightning II stealth strike-fighters, AH-1W/Z Super Cobra/Viper attack helicopters, MV-22B Osprey assault support tiltrotors, CH-53E Super Stallion heavy-lift helicopters, UH-1Y Venom utility helicopters, and SH-60F/HH-60H anti-submarine warfare helicopters.
However, rather than her usual wing of modern jets and helicopters, USS Essex is currently carrying 14 WWII-era trainer, bomber and fighter aircraft.
USS Essex usually carries Marine aircraft like these Ospreys (US Navy)
The 844-foot-long ship is on her way to Pearl Harbor, Hawaii to participate in RIMPAC 2020, the world’s largest international maritime exercise. Due to the ongoing COVID-19 pandemic, the Pentagon made the decision to cancel RIMPAC’s air exercises.
In January, Secretary of Defense Mark Esper called for a number of WWII-era aircraft to assemble in Hawaii to participate in a commemoration of the end of the war in the Pacific. Known as V-J Day for “Victory over Japan”, the event is most commonly celebrated on August 15. On August 15, 1945, (which was August 14 in America due to the time change), Emperor Hirohito announced his decree to accept the Potsdam Declaration and surrender over the radio.
Since the Marines had to leave their aircraft behind, USS Essex had plenty of room for the WWII-era aircraft since the vintage planes were unable to make the flight to Hawaii. The planes will include five AT-6/SNJ advanced trainers, two PBY Catalina flying boats, a B-25 Mitchell bomber, an FM-2 Wildcat fighter, an F8F Bearcat fighter, a Stearman Model 75 biplane, a TBM Avenger torpedo bomber and a T-28 Trojan.
The FM-2 Wildcat is lowered to the hangar deck (Commemorative Air Force)
The planes will conduct flyovers over Hawaii from August 29, the day U.S. troops began the occupation of Japan, to September 2, the day that the formal Japanese surrender was made aboard the USS Missouri in Tokyo Bay.
Before embarking on the trip to Hawaii, the pilots, maintainers and ground crews accompanying the planes were required to spend two weeks in quarantine at Naval Base San Diego to prevent anyone with COVID-19 from boarding the ship.
The 14 planes headed to Hawaii aboard the USS Essex will return to San Diego with the ship following the conclusion of the V-J Day Commemoration and RIMPAC.
Air Force Chief of Staff Gen. David Goldfein has a message for commanders on their physical condition: Get on a fitness program or your job is at risk.
Addressing a standing room-only ballroom of officers and airmen at the Air Force Association’s 2019 Air, Space & Cyber Conference on Sept. 17, 2019, Goldfein said he will launch an initiative Sept. 21, 2019, requiring officers in command billets to be in shape.
“If you are a commander in the United States Air Force, you are fit. There is no other discussion,” he said.
According to recently published Defense Department data, the Air Force has the second-highest percentage of obese troops, following the Navy. Some 18% of all airmen are obese, according to the most recent Health of the DoD Force report.
Goldfein didn’t provide specifics on his plan, but the initiative is part of an ongoing overhaul of Air Force fitness, designed to ensure that service members are fit without the current emphasis on the physical fitness assessment.
Air Force Maj. Michael Bliss, 703d Aircraft Maintenance Squadron commander.
(U.S. Air Force photo by Staff Sgt. Wes Wright)
He will underline his expectations by running the Air Force Half-Marathon at Wright-Patterson Air Force Base in Dayton, Ohio, on Saturday, a race for which Goldfein said he’s spent three months training and plans to complete. But “you can clock me … with a calendar,” he quipped.
“The point is … I don’t know when I am going to task [commanders] to deploy to Djibouti or Estonia or somewhere in the Pacific and expect you to perform the functions of an expeditionary commander in 120-degree heat or 30 below zero. I just know this: [That] is not the time to start your fitness program,” Goldfein said.
Squadron commanders, he added, will have an additional requirement: Unit fitness will be among the elements they will be graded on as part of a successful command tour.
“There are five elements of a command tour. It’s mission, culture, fitness, family and fun, and fitness is key. … We are going to do this from the top down,” Goldfein said.
Air Force Chief of Staff Gen. David L. Goldfein.
(U.S. Air Force photo by Staff Sgt. Chad Trujillo)
The Air Force is reviewing its physical fitness program with an aim to ensure that airmen sustain fitness throughout the year, instead of simply focusing their efforts on the semi-annual physical fitness assessment.
Among the ideas being considered are randomized testing, a longer time between tests for the superfit, and measures to reduce anxiety around test time.
Speaking alongside Goldfein, Chief Master Sergeant of the Air Force Kaleth Wright said the goal is to promote a culture of fitness across the force — a standard he said will improve readiness across-the-board.
“I wish all of us as the Air Force would spend more time throughout the year talking about health, fitness, nutrition and sleep than the time we spend on the test,” he said.
This article originally appeared on Military.com. Follow @militarydotcom on Twitter.
The United Nations Secretary-General António Guterres on Monday urged countries to immediately stop waging conflicts around the world in light of a “common enemy.”
“It is time to put armed conflict on lock-down and focus together on the true fight of our lives,” Guterres said, referring to the coronavirus pandemic that has placed numerous countries on lockdown. “The virus does not care about nationality or ethnicity, faction or faith. It attacks all, relentlessly.”
“Meanwhile, armed conflict rages on around the world,” Guterres said, adding that health networks in “war-ravaged countries” have since collapsed.
Due to the pandemic that has killed over 16,100 people and infected more than 367,000, Guterres said it was “time to put armed conflict on lockdown” and called for an “immediate global ceasefire in all corners of the world.”
The novel coronavirus spread across the world from China sometime late last year, according to health officials. At least 168 countries and territories reported cases of the coronavirus, prompting the World Health Organization to label it a pandemic on March 11.
China, where the epicenter of the coronavirus took root, appeared to make progress in stemming the number of infections by imposing strict lockdowns, according to its government. The country reported 39 new cases on Sunday, seven fewer cases from the day before.
In other parts of the world, however, the number of cases continues to increase. Italy saw the highest number of coronavirus-related fatalities, surpassing China, with 6,077 deaths. The US reported 483 deaths as of Monday afternoon.
“To warring parties, I say, ‘Pull back from hostilities. Put aside mistrust and animosity. Silence the guns, stop the artillery, end the airstrikes,'” Guterres said.
“End the sickness of war and fight the disease that is ravaging our world,” he added. “It starts by stopping the fighting everywhere. Now.”
When Brittany Boccher was approached by retired Major General Kendall Penn and the Arkansas Secretary of State Military and Veterans Liaison Kevin Steele to help get proposed legislation passed to protect the retirement pay of military retirees, Boccher jumped at the opportunity to serve her current community.
Boccher, a mother of two and the spouse of a special agent with the Air Force Office of Special Investigations, began the task by hosting the General and the Military and Veteran’s Liaison at one of the Little Rock Spouses’ Club meetings, where the men presented the proposed legislation to the local military spouses.
The proposal specifically addressed the taxation of pay for military retirees. While active duty personnel in Arkansas do not pay a state tax, retired veterans’ pay is taxed.
That tax didn’t sit well with Governor Asa Hutchinson and Lieutenant Governor Tim Griffin, who have seen their state ranked at 48 in attracting and retaining working age military retirees and veterans.
“A lot of them will retire really young in their 40s, 50s, 60s. And what do they do? They have that steady income and start other businesses or they go work a new job,” Griffin said.
Hutchinson agreed, saying, “I believe it will help us to bring more military retirees here, welcome them back to Arkansas.”
Boccher committed to calling or emailing every state senate committee member directly to discuss his or her support for Hutchinson’s proposed tax initiative. Then she set out to round up military families that would benefit the most from the initiative in order to testify before the state house and senate committees.
Boccher, a business owner in Arkansas herself, told We Are the Mighty that her family reflected the target audience the state was hoping to attract with the proposed tax break.
“They were seeking a young family close to retirement to showcase that they would have a second career after the military. We are a 17 year military family, we’re young, and with two small children. We want to stay in Arkansas and we own a business in Arkansas.”
Boccher said her family “checked all the boxes” for what Steele and Penn wanted to present as the ideal family the state was trying to attract.
Penn asked Boccher to testify before the state house and senate committees.
As a result of her hard work and commitment to the legislation, Boccher and her family were invited to the bill signing ceremony earlier this month.
On February 7, Hutchinson released a statement that read, in part, “…beginning in January [Arkansas] will also exempt military retirement pay. This initiative will make Arkansas a more military friendly retirement destination and will encourage veterans to start their second careers or open a business right here in the Natural State.”
For her part, Boccher is proud of what she’s accomplished for veterans while simultaneously running an apparel company, a photography company, and a non-profit organization, the Down Syndrome Advancement Coalition.
Additionally, Boccher is the president of the Little Rock Air Force Base Spouses’ Club and the 2016 and 2017 Little Rock Air Force Base Spouse of the Year.
Boccher had this to say about her work, “The military community is resilient, adaptable, dedicated, independent, supportive, and resourceful, but most of all they can make a difference, their voice can be heard, and they can and will make change happen!”
The Air Force’s and Boeing’s development of the new KC-46A Pegasus tanker has been waylaid by cost overruns and operational issues over the past several years.
Officials from the Air Force and Boeing have said that significant lingering problems, like contact between the KC-46’s refueling boom and the receiving aircraft during refueling, are expected to be resolved this year, ahead of Boeing’s October deadline to deliver 18 of the new tankers.
However, a report from the Pentagon’s Director of Operational Test and Evaluation has cautioned that while the KC-46’s most important systems could operate under EMP conditions, its operational capabilities in such a scenario have not been fully tested.
“While testing indicated the KC-46A flight-critical systems and boom refueling systems are likely survivable to the 6 decibel (dB) contractual requirement, the Program Office approved verification plan did not demonstrate the residual KC-46A mission systems capability during such an event,” according to the report, which covers fiscal year 2017 and was released last week.
“The program uninstalled or deactivated multiple mission-critical systems prior to testing and, therefore, their EMP tolerance was not tested on an aircraft in a mission-representative configuration,” the DOTE report said. “The program pre-deployed the refueling boom with hydraulics deactivated for the EMP test and therefore the capability to deliver fuel during or immediately following the EMP event was not tested.”
A KC-46 Pegasus refuels an A-10 Thunderbolt II, July 15, 2016. (Boeing photo by John D. Parker)
The KC-46 underwent EMP testing in July at Naval Air Station Patuxent River in Maryland and at Edwards Air Force Base in California. During the testing in Maryland, the plane received pulses from “a large coil/transformer” above the aircraft, designed to evaluate its “ability to safely operate through electromagnetic fields … under mission conditions,” Boeing said at the time.
The DOET report said no tests were conducted with all flight and mission systems activated — a step required to fully test the aircraft under EMP conditions. But representatives from the Air Force and Boeing said the KC-46 had proven its EMP functionality as mandated by its test plan.
Air Force spokesman Maj. Emily Grabowski told Inside Defense that mission-critical systems has passed testing and that the systems the DOTE report highlighted are “non-critical.” Grabowski added that, overall, the KC-46 met system specifications and that the Air Force was working with DOTE to “reconcile” concerns raised in the report.
Charles Ramsey, a spokesman for Boeing, said EMP testing was conducted according to the Air Force’s test plan and that systems designated critical by that plan showed their functionality on a subsequent flight. “There are no EMP issues on the KC-46,” he told Inside Defense.
The Air Force is planning two tests related to nuclear threats during fiscal year 2018, which began in October and ends in September. One will evaluate the KC-46s ability to launch and fly a safe distance from a simulated nuclear attack on its base, and the other will test the tanker’s “inherent nuclear hardness” to blast, radiation, flash, thermal, and EMP effects, according to the DOTE report.
The DOTE report also notes that the KC-46 contract was awarded with a six-decibel threshold for the aircraft — a standard that the aircraft met during testing in July. However, after the contract was signed, the US military imposed a new 20-decibel standard tanker aircraft.
Without further testing, the report says, the Air Force and US Strategic Command will not know if the tanker meets that new requirement. “The Air Force should re-test the KC-46A in an operationally representative condition to determine the actual EMP design margin,” the report concludes.
‘They’re going to clear out pretty quick’
In December, the FAA granted Boeing an amended type certificate for the Boeing 767-2C, which is the baseline aircraft for the KC-46. The firm still needs to get an FAA supplemental type certificates for the military and aerial-refueling systems needed so the 767-2C can function as a KC-46. Additional tests are expected during the final review process.
The Air Force currently expects to receive the first operational KC-46s by late spring. Air Force Gen. Carlton Everhart, chief of Air Mobility Command, told Air Force Times in December that once testing is finished and the new tankers star arriving, he expects “they’re going to clear out pretty quick” to Air Force bases.
Boeing won the KC-46 program contract 2011, and the Air Force plans to buy 179 KC-46s under the $44.5 billion program. As a part of the contract, Boeing is responsible for costs beyond the Air Force’s $4.82 billion commitment, and as of late 2017, the defense contractor had taken on about $2.9 billion in pretax costs.
Defense Secretary Jim Mattis has had limited involvement in Pentagon weapons programs, but he issued a stark warning to acquisition officials in November, saying he was “unwilling (totally)” to accept flawed KC-46 tankers.
Han-Ulrich Rudel was the kind of pilot that every soldier wants overhead. He was a close air support and dive bomber pilot who flew 3,500 combat missions and kept getting into the cockpit even after he was shot down 32 times and wounded five times.
Rudel began his career as a reconnaissance pilot in the Luftwaffe but entered dive bombing training as soon as he was allowed. After graduation in 1941, he was transferred to a Stuka dive bombing unit and flying in German blitzkrieg attacks. He would spend nearly all of his World War II career on Germany’s eastern front fighting the Soviets.
In Sep. 1941 he was sent against Soviet naval units and successfully sank the battleship Marat. In early 1943 he celebrated his 1,000 sortie. About a month later, in Apr. 1943, he took part in an attack against Soviet amphibious landing craft while flying a Ju-87. He sank 70 boats with the bird’s two 37mm cannons.
During the war, he pioneered a tactic where attack planes would hit the tanks from the rear. The primary benefit was that the planes could fire into the relatively thin armor over the tank’s engine, but it also meant that the planes were flying towards their own lines. That made it easier for pilots hit during an attack to make it back to friendly forces before bailing out.
Rudel’s willingness to fly low and slow to take out Soviet targets left him exposed to ground fire though, and he was shot down 32 times by anti-aircraft batteries. He was also wounded both on the ground and in the air.
His worst injury came while chasing a thirteenth tank kill in a fierce battle. After he fired off his final 37mm rounds, his right leg was shot off by anti-aircraft fire. Another pilot had to talk him through a crash landing and pull him out of the plane before he bled out.
Over his career, he destroyed 519 Soviet tanks, a battleship, a cruiser, a destroyer, 70 landing craft, and 11 airplanes. And he was famous for regularly landing and rescuing downed air crews. For his efforts, Rudel was awarded the Knight’s Cross of the Iron Cross with Golden Oak Leaves, Swords, and Diamonds, the second highest level of the Knight’s Cross. He was the only recipient of the award.
The only version of the award that was higher than Rudel’s was one specially made for Hermann Göring, and Göring basically got it for being head of the Luftwaffe, not for bravery.
For anyone who is feeling pretty good about Rudel and maybe hoping he was a Rommel-type German, the career military men who turned on Hitler when it became clear he was a monster, sorry. Rudel really was a hateful racist. He spoke out regularly in support of the Third Reich and was a member of a one of the most abhorrent German political parties from 1953 to his death in 1982.
In the world of combat, enemies of the U.S. don’t typically fight fair. So, as a defensive measure, we need to prepare for every possible situation that could arise — even situations that involve the use of outlawed weaponry.
Fortunately, our armed forces go through detailed training to prepare for an event in which one of the countries we occupy decides to get froggy and releases a chemical attack.
It’s no secret that such chemicals exist and to combat the threat, allied forces have the technology readily available.
Not all released chemicals are absorbed into the human body via inhalation. For some dangerous substances, any contact with the body can be deadly. So, the military has unique suits and a system called “Mission Oriented Protective Posture” to define the level of protection required by each circumstance.
The MOPP system technically has five different levels. Level 0 means the area appears to zero threat, but troops must still keep those specialized suites handy. This level rises as dangers become greater so that troops know to don additional gear for protection.
You might ask yourself, what if the troop works as a tanker and they cant put on their MOPP gear fast enough due to a lack of space?
That’s a great question and we’re glad we asked.
Moden day tanks and light armored vehicles are built to protect the troops inside, even in the event that the enemy decides to pass gas. Get it? How funny are we, right?
The cleverly constructed vehicles are fitted to have all the hatches seal airtight when closed. Those light armored reconnaissance vehicles are well constructed that they can maneuver through harsh terrain during attacks like it’s no big deal.
Mindy N. asks: After a long run my leg muscles are tired, but my heart is not. Why doesn’t the heart need any rest?
An average of around 60 to 100 times every minute of every day of every year of your ultimately meaningless life, your heart beats… until it doesn’t. Not long after it stops, all knowledge of your having existed is rapidly forgotten. Unlike the other muscles in your body, however, your heart steadfastly rages against the dying of the light, refusing to ever get tired. But how does it manage this and why are your other muscles such slackers in comparison?
To begin with, the human body is broadly composed of three types of muscles: skeletal, smooth and cardiac. Skeletal muscles are striated (banded), and are what most of us think of when we envision a muscle — controlling pretty much all voluntary, and some involuntary, body movement.
Like cardiac muscle, skeletal muscle derives energy from ATP (Adenosine triphoweknowyoudontcare), with this being made in a few different ways. To avoid going full textbook, we’ll just briefly give the high level over simplified view here. In a nutshell, the slowest, but most efficient, method of ATP production is via aerobic respiration where mitochondria in your muscle cells draw energy from the Dark Dimension, producing ATP, a small amount of which is stored in your muscles at any given time. This stored amount is a sufficient supply to last for about 3 seconds of vigorous activity, not unlike your high school boyfriend.
Diagram of the human heart.
After this supply is taxed, with the ATP converted to ADP (adenosine diphosophate) in the process, creatine phosphate in the muscles is used to convert it back to ATP. This supply will last about 8-15 seconds.
Next up, it turns out we were totally wrong about that whole Dark Dimension thing as, in fact, your muscles continue to get ATP beyond this via a series of chemical reactions resulting in glucose being used to make the needed ATP to keep going. This glucose comes from a variety of sources, such as glycogen in your muscles, or via blood via fats, protein, stores in the liver, and from your food churning away in your intestines.
There are two high level ways this production of ATP ends up being accomplished. In the first, using large supplies of oxygen. In this case, as much as 38 ATP molecules can be produced for every glucose molecule. In the second case, via anaerobic glycolysis — not requiring oxygen — only 2 molecules of ATP are produced for each molecule of glucose. While an extremely inefficient use of the available supply of glucose, this method at least produces the ATP over two times faster than aerobic respiration and continues working for a time while you’re out of breath.
Due to glycolysis resulting in the accumulation of lactic acid in the muscles, ultimately if it accumulates faster than it can be gotten rid of, it will interfere with the anaerobic glycolysis process and your muscles are going to go all jelly and cease to work as well for a little bit. This is in part why, if you get out of breath when exercising and your body is relying more on anaerobic glycolysis, you get fatigued extremely quickly. In this case, you’re simultaneously creating lactic acid at a much more rapid rate and using up your available glucose molecules faster, but producing relatively small amounts of ATP for those molecules used. Do this for more than a minute or two and it will overtax your skeletal muscles’ ability to produce the needed ATP at the rate you’re using it. (Though, again, your mileage will vary based on your current fitness level.)
Back it off and so you’re relying mostly on aerobic respiration and you’re going to get the most bang for your buck, able to keep going all night long if you keep hydrated and well fed. Slow and steady wins the race.
Unsurprisingly from all of this, the more mitochondria there are, the faster ATP can potentially be produced if the needed molecules are present and the more the muscle can keep on keeping on. As for skeletal muscle, about 2%-8% of the volume of such muscle is mitochondria, though this varies somewhat from person to person depending on your level of physical fitness.
Moving on to smooth muscle, as you may have gleaned from the name, this is smooth with no striations. Found in your hollow internal organs (except the heart), smooth muscles work automatically, helping you digest food, dilate your pupils and take a wee-wee. As an example of smooth muscle in action, in digestion, the contractions themselves are really not too dissimilar to how your heart beat works — fluctuation of electrical potential in the smooth muscle cells which causes the muscle to contract in a rhythmic fashion, in this case called the “Basic Electrical Rhythm” or BER. This rhythm is about three times per minute in the stomach, and 12 times per minute in the small intestines. The sound you are hearing when your stomach and intestines make noise is the result of these muscular contractions mixing and moving chyme (the cocktail of digestive juices, food, microbes, etc.) and air along down the tube between your mouth and your waste disposal port.
As for the mitochondrial needs of these muscles, they are typically approximately that of your skeletal muscles, with mitochondria making up about 3-5% of the smooth muscle volume.
This finally brings us to the real hero of your life story — cardiac muscle. Like skeletal muscle, cardiac muscle is striated and like the other muscle in your body is primarily powered by mitochondria. The cardiac muscles, however, have as much as 10 times the density of mitochondria as your other muscles, at about 35% of the volume of your cardiac muscle.
It should also be noted that individual muscle cells in the heart actually do get regular rest thanks to how the heart beat actually works, which we’ll get into in the Bonus Fact in a bit. But the net result is that about 60%-70% of your life a given part of your heart is actually in a resting state.
Combining these micro-rests with the extreme amount of mitochondria and a large amount of oxygen from the heart’s awesome blood supply, this allows your heart all the ATP it needs to not get tired, assuming you’re not in an extreme state of starvation or doing some extreme form of exercise for extended periods well beyond your normal fitness regime.
On that note, the downside to needing so much ATP thanks to no extended downtime is that the heart really needs to rely on aerobic respiration to make sure it doesn’t run out of ATP, and thus it doesn’t take oxygen being cut off for too long from it before you’re going to have a bad time, unlike other muscles you can just stop using to help recover the needed ATP over time.
And, yes, it turns out the human heart can actually get tired and suffer damage if you’re trying to do some extreme form of physical activity outside your norm for lengthy periods, especially if in a low oxygen environment like at high altitude. In these cases, even the healthiest hearts can suffer damage, though given the other effects on your body of such extreme physical activity, typically most people will stop doing whatever before the heart is negatively impacted in a damaging way. In essence, your legs will give out before your heart does (usually), at least when talking energy supply. But that doesn’t mean in certain cases a measurable level of tiredness in the heart can’t be observed.
For example, in 2001, cardiologists studied a few dozen endurance athletes competing in a 400 km race in Scotland, which comprised of all manner of physical activities from paddling, rope climbing, running, biking, climbing, etc. and the whole event taking almost 100 hours. During this span, the athletes typically only slept about 1 hour per 24 hours during the event and otherwise soldiered on.
The results? At the end of the race, the athletes’ hearts were only pumping about 90% of the volume per beat they’d been managing before the race started.
That said, further research on endurance athletes calls into question the notion of “no permanent damage” being done. For example, researchers involved in a 2011 British study looking at British Olympians who competed in distance running and rowing (and specifically competing in at minimum a hundred events), found that as they aged they showed marked signs of heart muscle scarring, something that can lead to irregular heart function and, potentially, heart failure.
Of course, these are extreme examples, and for most people not doing ultra marathons regularly or competing professionally or semi-professionally in endurance events, this is unlikely to be a problem and the holistic health benefits of regular, vigorous exercise are likely to make up for it even then.
Ever wonder how the heart beat works? Well, wonder no more. In a nutshell, the heart is a four chambered pump. The top two chambers are called Atria, the bottom two are called Ventricles. They are separated from top to bottom by valves; the right and left sides are separated by a septum. So what makes the pump squeeze? When the hearts muscle gets “shocked”, it will contract and force the blood down its path, with the valves not allowing blood to flow back through the system, unless they are defective.
The blood’s path through the heart starts in a vein called the Superior Vena Cava. Then it enters the right atrium, flows through the tricuspid valve into the right ventricle. From there it travels through the pulmonic valve into pulmonary arteries, then the lungs. Now back to the heart and into the left atrium, through the mitral valve. The blood is now in the “strongest” chamber of the heart, the left ventricle. From there it gets pumped through the aortic valve and into the aorta and out to the rest of the body!
So what causes that infamous electric shock the heart receives approximately 60-100 times a minute? Short answer: Dormammu. Long answer: The exchange of electrolytes across specialized cells within the heart build up a differing electrical potential on either side of the cell. When this electrical potential reaches a certain level, it discharges and sends a shock down another unique set of cells within the heart, causing a shock and thus the contraction.
The specific set of cells that regulates the heart rate (in most people) are called the Sinoatrial node or SA node for short. The SA node (pacemaker of the heart) sits in the upper portion of the R atria near the entrance of the superior vena cava.
When the SA node sends out and electrical shock, it immediately shocks the atria. The pulse then gets “held up” in another set of cells called the Atrioventricular node, or AV node for short. This then transmits the impulse down to the bundle of His and then to two pathways called the right and left bundle branches. Then it’s transmitted to the rest of the Ventricles through what are called Purkinje fibers. All together this “shock” causes the atria to contract, then the ventricles. You’re still alive! (For now.)
So what and how do these electrolytes cause this shock? In an attempt not to give a physiology lecture of ungodly proportion, we will simply say that the main two electrolytes involved are sodium and potassium. Potassium normally sits inside the cell, and sodium outside. Potassium slowly leaks outside of the cell and sodium then goes inside the cell. This creates the differing electrical potential that builds up until the point of discharge. Other electrolytes also help in creating this differential, and they are calcium and magnesium. All together the harmony created by this yin and yang system of electrical and mechanical systems come together to make that wonderfully thumping thing inside your chest!
This article originally appeared on Today I Found Out. Follow @TodayIFoundOut on Twitter.
The former top American commander in South Korea on Thursday said the Trump administration must be ready to launch a pre-emptive strike on North Korea before it tests a long-range missile capable of hitting the U.S. mainland.
“I don’t think any talking, any diplomacy, is going to convince Kim Jong-un to change,” retired Army Gen. Walter Sharp said of the North Korean leader in suggesting the possibility of a pre-emptive strike to eliminate the nuclear threat.
Should North Korea put a missile such as the three-stage Taepodong 2 on the launchpad, and the U.S. was unsure whether it carried a satellite or a nuclear warhead, the missile should be destroyed, said Sharp, the former commander of U..S. Forces-Korea and the United Nations Command from 2008 to 2011.
The U.S. also must be ready to respond with overwhelming force if North Korea retaliated, Sharp said. “If [Kim] responds back after we take one of these missiles out,” he should know “that there is a lot more coming his way, something he will fear,” Sharp said.
“I think we’re to that point that we need to have that capability. I am to that point,” he said, adding that the U.S. could not risk relying solely on anti-missile defenses to counter North Korean long-range missiles.
Sharp spoke at a panel discussion on challenges from North Korea at an all-day forum sponsored by the Center for Strategic and International Studies in Washington, D.C., on the national security issues that will confront President-elect Donald Trump.
Others on the panel, while sharing Sharp’s concerns about the North Korean nuclear threat, worried about the aftermath of a pre-emptive strike. Despite North Korea’s nuclear tests, “there is potential in diplomacy,” said Christine Wormuth, the former undersecretary of defense for policy in the Obama administration.
“I’m concerned about pre-emptive action on the launchpad,” Wormuth said. “What does Kim Jong-un do in response? I worry quite a bit about our ability to sort of manage a potential retaliation.”
During the campaign, Trump called Kim Jong-un a “bad dude” and a “maniac,” but also said he might be willing to meet with Kim over a hamburger to defuse tensions on the peninsula.
The panel discussion came a day after the U.N. Security Council imposed new sanctions on North Korea aimed at cutting its export revenues. The latest sanctions were in response to the country’s fifth and largest underground nuclear weapons test, which occurred in September.
The 15-member council unanimously adopted a resolution to slash North Korea’s exports of coal — its main export item — by about 60 percent and also imposed a ban on its export of copper, nickel, silver and zinc.
Samantha Power, the U.S. ambassador to the United Nations, said that the sanctions would cost North Korea about $800 million annually.
“No resolution in New York will likely, tomorrow, persuade Pyongyang to cease its relentless pursuit of nuclear weapons, but this resolution imposes unprecedented costs,” she said.
In a statement, North Korea’s Foreign Ministry said the sanctions would have no effect on the regime’s pursuit of nuclear weapons and delivery systems.
“There will be no greater miscalculation than to think that Obama and his henchmen can use the cowardly sanctions racket to try to force us to give up our nuclear armament policy or undermine our nuclear power status,” the statement said.
There’s probably no greater argument in favor of issuing bottled beer to troops in combat than the story of William Speakman.
In 1951, the 24-year-old Speakman volunteered for service in the Korean War.
He initially joined the Black Watch Royal Highland Regiment, but was attached to the 1st Battalion of the King’s Own Scottish Borderers during his time in Korea.
By 1951, the war had turned on the UN troops fighting in the peninsula. After near annihilation along the Korea-China border, Communist forces were bolstered when China entered the war for North Korea.
Later that year, William Speakman and his unit were somewhere along the 38th parallel – the new front – on a freezing cold, shell-pocked hill along the Imjin River. It was known as Hill 317.
On Nov. 4, 1951, Speakman’s unit was suddenly pummeled by intense Chinese artillery and a tide of overwhelming human wave attacks.
What happened next earned William Speakman the nickname “Beer Bottle VC.”
Speakman, a junior enlisted infantryman acting without orders, led a series of counter-charges to prevent his position from being overrun. He and six other men from the King’s Own fought an estimated 6,000 oncoming Chinese infantry troops. Speakman himself began to hurl as many grenades at the Chinese waves as he could, even after suffering multiple wounds.
“It was hand-to-hand; there was no time to pull back the bolt of the rifle,” he told the Telegraph. “It was November, the ground was hard, so grenades bounced and did damage.”
His cache of grenades didn’t last forever, of course. When he exhausted his unit’s explosives supply, he turned to any other material he could find to throw at the enemy horde, which included rocks and a steady supply of empty beer bottles. He and his six buddies were able to hold off the Communist onslaught long enough for the KOSB to withdraw safely.
“I enjoyed it, actually, it’s what I joined up to do,” Speakman said in an interview with the Royal British Legion. I volunteered for Korea and joined the KOSB… we did what you’re trained to do as a soldier. We fought that night and did what we had to.”
“When I got it, the king was alive,” Speakman said. “But he was very ill. He awarded me the VC but he died. So I was the queen’s first VC… I think she was nervous. And I was very nervous.”
Only four VCs were awarded during the Korean War and Speakman is the only living Victoria Cross recipient from that war. Though Speakman went on to serve until 1967 and fought in other conflicts in places like Italy and Borneo, he wants his ashes to be scattered in the Korean DMZ.
On May 9, 1941, the German U-boat U-110 was captured by the Royal Navy, and with it, a number of German cipher documents and an intact Enigma machine.
The Enigma was a brilliant piece of German enciphering machinery that allowed their military to send messages securely. The Germans were so efficient with Enigma that they even had a method for changing the cipher system daily. The device was exceptionally sophisticated, mechanically scrambling the 26 letters of the alphabet based on the daily cipher code. In order to decrypt an Enigma-encoded message, one would need both a machine and the daily cipher.
Later named “Operation Primrose,” the U-boats’ capture remained a secret for months while codebreakers at Bletchley Park got to work. Using the documents on board, they were able to crack a hand-cipher system that was used as a backup to Enigma. In other words, they had access to German messages in plain text and in cipher text, which allowed them to decrypt future messages.
Codebreakers at Bletchley Park, including the now-famous Alan Turing and fellow code-breaker Gordon Welchman, were able to use critical intelligence like that obtained from U-110 to invent a machine known as the Bombe, which automated much of the Enigma decryption work.
With this information, the Allies were able to strategically respond to Enigma-encrypted messages and deliver decisive blows to the Nazi war force.
The work of Bletchley Park, including Turing’s role there in cracking the Enigma code, remained classified until the 1970s, but it has been estimated that the work of the code-breakers shortened the war by several years and saved countless lives.
Featured Image: U-110 was captured by HM Ships Bulldog, Broadway, and Arbretia. (Royal Navy Photo)
There’s only one person aside from the Secret Service who brings guns to the White House every day. That would be Chef Andre Rush, who can be found in the gym when he’s not cooking up a storm for the leader of the free world. As you can imagine, his fitness routine is heavy on arm work and (of course) his diet.
Rush not only tends to his biceps with what some might consider an excessive amount of curls, he also pumps up with the 22 Pushup Challenge every weekday, his part in raising awareness of the estimated 22 military veterans who die from suicide every day. Only, Andre Rush doesn’t just do 22. He does 2,222 pushups on top of his 72-hour rotating isolation schedule. Chef Rush is himself a military veteran who served in the Army before he ended up in the White House kitchen. He has served supper to Presidents Clinton, Bush 43, Obama, and now Trump – and their families, of course.
Food is still, thankfully, bipartisan.
Rush joined the Army as a cook in 1994. His military career took him through culinary training before he started serving the goods at the Pentagon, and eventually, the White House. He retired only 18 months ago. He still works as a consultant for the White House.
“The camaraderie among the chefs reminded me of hanging out with my friends back in Mississippi, and I got tired of being serious and being out in the field 24/7,” he told Men’s Health Magazine. “Plus, I just love to eat!”
A diet for this force of a man consists of 12-24 hard-boiled eggs, only two of which are whole eggs. For the rest, he eats only the whites. He also downs his own peanut butter protein shake with blended quinoa and nonfat milk. For the rest of his training meals, he eats greek yogurt, oatmeal, and lean turkey – at the gym. He snacks on the turkey in the gym. For his afternoon meals, he consumes four roasted chickens.