Naval Sea Systems Command (NAVSEA) approved the first metal part created by additive manufacturing (AM) for shipboard installation, the command announced Oct. 11, 2018.
A prototype drain strainer orifice (DSO) assembly will be installed on USS Harry S. Truman (CVN 75) in fiscal year 2019 for a one-year test and evaluation trial. The DSO assembly is a steam system component that permits drainage/removal of water from a steam line while in use.
Huntington Ingalls Industries — Newport News Shipbuilding (HII-NNS) builds Navy aircraft carriers and proposed installing the prototype on an aircraft carrier for test and evaluation.
“This install marks a significant advancement in the Navy’s ability to make parts on demand and combine NAVSEA’s strategic goal of on-time delivery of ships and submarines while maintaining a culture of affordability,” said Rear Adm. Lorin Selby, NAVSEA chief engineer and deputy commander for ship design, integration, and naval engineering. “By targeting CVN-75 [USS Harry S. Truman], this allows us to get test results faster, so — if successful — we can identify additional uses of additive manufacturing for the fleet.”
The test articles passed functional and environmental testing, which included material, welding, shock, vibration, hydrostatic, and operational steam, and will continue to be evaluated while installed within a low temperature and low pressure saturated steam system. After the test and evaluation period, the prototype assembly will be removed for analysis and inspection.
The aircraft carrier USS Harry S. Truman transits the Gulf of Oman.
(U.S. Navy photo by Mass Communication Specialist 3rd Class Taylor M. DiMartino)
While the Navy has been using additive manufacturing technology for several years, the use of it for metal parts for naval systems is a newer concept and this prototype assembly design, production, and first article testing used traditional mechanical testing to identify requirements and acceptance criteria. Final requirements are still under review.
“Specifications will establish a path for NAVSEA and industry to follow when designing, manufacturing and installing AM components shipboard and will streamline the approval process,” said Dr. Justin Rettaliata, technical warrant holder for additive manufacturing. “NAVSEA has several efforts underway to develop specifications and standards for more commonly used additive manufacturing processes.”
Naval Sea Systems Command is the largest of the Navy’s five systems commands. NAVSEA engineers, builds, buys and maintains the Navy’s ships, submarines and combat systems to meet the fleet’s current and future operational requirements.
WATM’s Ryan Curtis hits the streets with stunt driver Jim Wilkey, a Vietnam War vet whose Hollywood credits include “Die Hard With a Vengeance,” “Rush Hour,” “Inception,” “Mad Max: Fury Road,” and “The Dark Knight Trilogy.’ Jim’s experience in the Navy working with a wide range of equipment gave him the knowledge to get started as a stuntman and stunt driver.
Follow along as Jim (bravely) lets Ryan get behind the wheel and try his hand at the stunt course.
Iranian state TV cited a report by the Associated Press (AP) claiming that 100 bodies were found at the site of a US military plane crash in Afghanistan, but the news agency says this report doesn’t exist.
The Islamic Republic of Iran News Network (IRINN), which is part of the state-run Islamic Republic of Iran Broadcasting, reported Tuesday, according to BBC Monitoring: “US authorities have not yet released official casualty figures but the Associated Press, quoting local officials in Ghazni Province in Afghanistan, has announced that nearly 100 corpses have been found at the crash site.”
The AP has published reports on the disaster, but none of them have contained the 100-bodies figure. The AP told Business Insider it did not report this.
Neither officials in the US nor in Ghazni, the Taliban-held province where the crash took place, have given a death toll so far.
US officials on Tuesday recovered the remains and are confirming the identities of people involved in the crash, Reuters reported. The officials did not give a number.
The plane, a US Air Force Bombardier E-11A, is widely believed to have been carrying no more than six people at the time of the crash. New York Times correspondent Mujib Mashal said on Tuesday that the most widely-cited figure is two.
Ghazni provincial police chief Khalid Wardak told Reuters on Tuesday “there are four bodies and two onboard were alive and they are missing,” but said Taliban fighters repelled Afghanistan’s attempt to access the crash site.
Iran’s state-run Channel One network also peddled a theory that a senior CIA official named Michael D’Andrea had been on the plane.
Deadlifts are a power movement. This simple yet satisfying act involves loading a bar with heavy plates, chalking up your palms, and pulling it off the ground from a dead stop. It’s the essence of strength: you pick it up and then put it down. No fancy footwork or complex movements required — just a strong back and calloused hands.
The deadlift is an effective way to strengthen the entire posterior chain, and it offers benefits to anyone and everyone, regardless of athletic ability. But many people fear it for a variety of reasons.
In the 1960s, half the population had a physically demanding job. In 2011, that number shrank to just 20 percent. Technology has made our work less labor intensive, causing a decline in our overall health. We sit more than we stand, and we type more than we lift.
There are fewer labor-intensive jobs in the 21st century — and that’s not necessarily good for our health.
(Photo from the University of Northern Iowa’s Fortepan Iowa Archive)
Today, low back pain is one of the most common musculoskeletal conditions and is typically reported as one of the top three workplace injuries. That shouldn’t deter you from practicing deadlifts though — it should encourage you.
A study conducted in 2015 monitored patients using deadlifts as a part of the treatment plan for back pain. Seventy-two percent of participants reported a decrease in pain and an increase in overall quality of life.
Whether you’re picking up a laundry basket, a child, or a package in the mail — everyone deadlifts. The act of picking something up is a daily occurrence. The more we train our bodies with lifts that mimic life or our job, the more they will resist injury in our life. And if you’re in the U.S. Army, you don’t have a choice: the deadlift is slated to become a mandatory event in the new Army Combat Fitness Test in 2020.
1st Lt. Jake Matty, a Soldier from 1st Battalion, 21st Infantry Regiment, 2nd Infantry Brigade Combat Team, 25th Infantry Division (Gimlets) begins the 3-repetition strength deadlift during a field-testing of the Army Combat Fitness Test.
(Photo by SPC Geoff Cooper/U.S. Army)
However, people are intimidated because the lift can cause major problems when performed incorrectly. The most common mistakes associated with the deadlift are easily correctable:
Rounding the back: When you lose a neutral spine position, the risk of disc herniation is increased. To combat this is, ensure you have tension applied prior to lifting the weight. Activate the latissimus dorsi muscles (lats) by imagining you have an orange in your armpit that you need to squeeze.
Neck misalignment: Ensure your neck is in line with your back. As you lift the bar, your neck should rise at the same rate as your back.
Improper setup: The bar should rest no more than 1 to 2 inches in front of your shins, and your knees should remain vertical to the ankles. If the knees are pushed forward, the barbell is forced to move around them, putting stress on the low back.
The anatomy of a deadlift.
(Photo courtesy of Calispine)
If you’re ready to get started, head down to your local gym — you’ll need a barbell and plates for weight. I recommend trying these three deadlift variations, which offer simplicity and massive benefits. And don’t be afraid to ask a trainer or experienced lifter to take a look at your form!
1. Landmine Deadlift
The term “landmine” indicates that the barbell is anchored into a holder or a corner to angle it. This lift is generally safe because the body remains mostly upright and encourages a flat back.
The trap bar deadlift engages the same muscle groups as a traditional deadlift but puts additional stress on the quadriceps, glute muscles, and hamstrings. The trap bar was designed for the lifter to grip the bar at the sides rather than in front and, in turn, puts less stress on the back.
This variation is beneficial for lifters who want to increase the positional strength of the lower back, hips, and hamstrings. It also serves as an accessory movement to increase traditional deadlifting numbers. The weight you’re able to lift will be less during this variation but will increase when you convert to a traditional style.
As with anything in life, when something is done incorrectly, there is a chance of negative consequences — in this case, possible injury. But with proper execution, the benefits of the deadlift can be lifelong.
They’re the units that everyone wants to beat, that every commander wants to squash under their heel, and that most average Joes accuse of cheating at least once — the “Opposing Forces” units at military training centers.
The OPFOR units are comprised of active duty soldiers stationed at major training centers and are tasked with playing enemy combatants in training exercises for the units that rotate into their center. They spend years acting as the adversary in every modern training exercise their base can come up with.
So while most units do a rotation at a major training center every couple of years, soldiers assigned to OPFOR units often conduct major training rotations every month. This results in their practicing the deployed lifestyle for weeks at a time about a dozen times per year.
Through all this training, they get good. Really good.
And since they typically conduct their missions at a single installation or, in rare cases, at a few training areas in a single region, they’re experts in their assigned battlespace.
All this adds up to units with lots of experience against the best units the military has to deploy — units that are at the cutting edge of new tactics, techniques, and procedures; units that have the home field advantage.
“The first time you fight against the OpFor is a daunting experience,” Maj. Jared Nichols, a battalion executive officer that rotated through the National Training Center at Fort Irwin, California, said during a 2016 training iteration. “You’re fighting an enemy that knows the terrain and knows how American forces fight, so they know how to fight against us and they do it very well.”
An OPFOR Surrogate Vehicle from Coldsteel Troop, 1st Squadron, 11th Armored Cavalry Regiment, travels through the city of Dezashah en route to the objective, during NTC rotation 17-01, at the National Training Center, Oct. 7, 2016. The purpose of this phase of the rotation was to challenge the Greywolf Brigade’s ability to conduct a deliberate defense of an area while being engaged by conventional and hybrid threats. (Photo: U.S. Army Sgt. David Edge)
For the military, this arrangement is a win-win. First, rotational units cut their teeth against realistic, experienced, and determined opponents before they deploy. This tests and stresses deploying units — usually brigades — and allows them to see where their weak points are. Do their soldiers need a tool they don’t have? Are there leaders being over or under utilized? Does all the equipment work together as expected?
But the training units aren’t expected to get everything right.
“One of the largest challenges I face as the OPFOR battalion commander is conveying the message to the other nations that it’s OK to make a mistake,” Lt. Col. Mathew Archambault said during a 2016 training rotation. “When they come here it’s a training exercise, and I want them to take risks and try new things. I want them to maximize their training experience; it helps them learn and grow.”
But the military also gets a group of soldiers that, over a two or three-year tour of duty at a training center as opposing forces, have seen dozens of ways to conduct different missions. They’ve seen different tactics for resupplying maneuver forces in the field, different ways of hiding communications, different ways of feinting attacks. And, they know which tactics are successful and which don’t work in the field.
When it’s time for these soldiers to rotate to another unit, they take these lessons with them and share them with their new units.
Everyone has heard the old stories of judges forcing someone guilty of a small-time crime to choose between a hefty jail sentence or joining the Army. Or the Marine Corps. Or the Navy.
It seems like back in the old days, getting pinched for lifting car parts or selling bootleg cigarettes could end up with the defendant doing a two-year stint in Korea – which could be just as bad as jail, except you get paid.
The practice isn’t as common as it used to be as it turns out. The U.S. military isn’t engaged in a global effort to defeat communism anymore and the days of a peacetime draft are long gone. With the benefits set aside for people joining what is now an all-volunteer force, the military isn’t hurting for new employees.
At least for the most part. It definitely doesn’t require people who would be considered convicts if they hadn’t become soldiers, sailors, airmen or Marines.
But in the courtroom, the judge is the absolute ruler. Ruling from the bench means ruling by decree and, within the limits of the Constitution and existing law, the judge can pronounce whatever sentence he or she deems fit.
For a long time, that meant the choice between military service or jail time. But the individual branches of service aren’t a part of the judge’s court and though the judge can order such a sentence on a defendant, that doesn’t mean the military has to take them.
The most recent and notable case of such a choice was that of Michael Guerra of Upstate New York. In 2006 Guerra was facing a conviction of aggravated assault. According to Stars and Stripes, the judge was willing to discharge Guerra if he joined the military. Guerra agreed. The Army did not.
Keep in mind, this was at the height of the Iraq War, when the Army needed soldiers more than anything. The Army preferred to take the PR hit of instituting stop-loss programs rather than take cons like Guerra.
The policy of not taking “jailbirds” is actually part of the Army’s recruiting regulations. Regulation 601-210, paragraph 4-8b reads:
“Applicants who, as a condition for any civil conviction or adverse disposition or any other reason through a civil or criminal court, is ordered or subjected to a sentence that implies or imposes enlistment into the Armed Forces of the United States is not eligible for enlistment.”
Described variously as everything from “the greatest B-movie ever made” to a masterpiece of horror and suspense, John Carpenter’s The Thing, which debuted on June 25, 1982, is a movie that rightfully stands amongst the likes of Alien and The Terminator as one of the most kick-ass sci-fi movies in history. The thing is, it turns out The Thing was so poorly received when it debuted that it nearly ruined Carpenter’s career.
First, for anyone unfamiliar with the The Thing, the basic plot is that a shape-shifting alien organism from the depths of space crash lands in the middle Antarctica and begins brutally assimilating the denizens of an American research base. Throughout the film, in traditional horror movie fashion, the eponymous Thing slowly kills off the cast while Kurt Russell, sporting the bushiest beard of his career, tries to incinerate it with a flamethrower. Of note is the fact that the film ends on a cliffhanger, showing Russell’s character staring down known hero of this Earth Keith David, as they both sit around waiting to freeze to death and come to the realization that one of them could be the Thing… The fate of neither man is made explicitly clear, leaving what happens next largely up to the interpretation of the audience.
For some reason audiences and critics hated this, with many a scathing review being written criticizing the movie’s nihilistic tone and lack of a satisfying conclusion to the story. This somewhat annoyed director John Carpenter who did actually film a more positive ending after being pressure by the studio, but ultimately cut it because it felt, in his words “cheesy”. As Carpenter would later note of the general reaction to the film’s ending: “The film wasn’t heroic enough, it wasn’t the U.S. Hockey team beating the Russians. That’s what people wanted to see.”
Filming of “The Thing,” 1982.
Not stopping there, perhaps the most baffling criticism levied against the film came courtesy of New York Times reviewer Vincent Canby who described the film’s practical effects as “phony looking“. A bold claim considering the film’s practical effects are still referenced today by experts in the field as being some of the most technically impressive ever seen on the silver screen.
The endless dunking on Carpenter didn’t stop with reviews, though, and the director of the film The Thing was loosely based upon, The Thing from Another World, Christian Nyby would later release a statement saying that the film was terrible. As if that wasn’t a bitter enough pill to swallow, following the bad reviews and exceptionally poor box office returns the film saw (it only managed to bring in million on a budget of million), Universal yanked Carpenter off of his next directing project and then bought out of the rest of his contract so that he wouldn’t make any more movies for them.
John Carpenter’s The Thing original trailer (1982) HQ
Carpenter, as you can imagine, was hurt by the critical mauling the film received, including being particularly stung when Sydney Magazine had a cover story on the movie titled: “Is This the Most Hated Film of All Time?”
Needless to say, Carpenter refused to comment on The Thing publicly for many years. Of course, over the years the critical consensus on the film has shifted dramatically and The Thing is now considered one of the greatest and most influential horror movies ever made. Which begs the question, what gives?
Well, according to Carpenter, one of the key reasons he believes the film flopped was E.T. the Extra-Terrestrial, which was released just two weeks before The Thing. Said, Carpenter, “I just don’t think audiences in 1982 wanted to see that. They wanted to see E.T. and The Thing was the opposite of that… I was called ‘a pornographer of violence’… I had no idea it would be received that way… The Thing was just too strong for that time. I knew it was going to be strong, but I didn’t think it would be too strong…”
In the end, he didn’t think audiences were ready for a movie about a shape-shifting alien murder-beast so soon after one about a happy, friendly little alien who likes eating Reese’s Pieces.
This article originally appeared on Today I Found Out. Follow @TodayIFoundOut on Twitter.
Over the years, it has become a running joke of sorts that Batman’s glorified fanny pack contains whatever items he needs to fulfill his current mission, regardless of how unlikely a scenario the caped crusader may find himself in. This leads us to the query of the hour- what has Batman’s utility belt been shown to contain?
Up until the release of Detective Comics #29, which formally introduced the idea of Batman having a utility belt, Batman’s costume had, for all intents and purposes, an ordinary belt that stored a single gadget- the bat rope with a grappling hook.
Whats in Batmans Utility Belt & Other Bat Gadgets? – Know Your Universe | Comicstorian
In Detective Comics #29, writer Gardner Fox decided to expand his tool-set, establishing that the Dark Knight wore a belt with numerous pouches containing various gadgets he may need while fighting crime- the first revealed being small glass pellets that when thrown released a large cloud of obscuring, choking gas.
From there things became a bit more elaborate. For example, among other things the utility belt was shown to include a giant balloon figure of batman that can be inflated remotely (Batman #115), a mini Geiger counter (Batman #117), and even a small disk made of asbestos inexplicably revealing his secret identity (Detective Comics #185).
In the 1958 comic Batman #117, it even shows him carrying shark repellent, for all those times one needs to fend off sharks while fighting crime on the streets of Gotham… If you’re curious, in this case Batman was underwater on an alien planet. Lucky for him, he remembered to pack his shark repellent and used it against an angry alien, reasoning that “if it works on the killers of the deep on Earth” it might just scare away a similar creature on an alien planet. We mention this because it gives the infamous scene in the 1966 Batman film where Adam West fends off a shark in mid-air with some handy Shark Repellent Bat Spray some context. Glorious, 1950s era context with pure West.
Later comics also establish that Batman has gadgets specifically designed to counter single members of his rogues gallery such as an antidote to the Joker’s Joker toxin, a Bat-heater to combat Mr Freeze, and special gloves that augment his punching power to fight on a more even playing field with the superhumanly strong villain Bane. Not just for enemies, Batman also apparently keeps what’s needed on hand to take out his allies as well, including a little bit of kryptonite, just in case.
It should also be noted here that in his very earliest comic outings, Batman’s utility belt had space for a handgun. Yes, as sacrilege as this would be in modern times, early versions of Batman had no qualms about shooting bad guys dead.
As for more day to day things, Batman’s utility belt further carries: A first aid kit containing basic surgical tools and various anti-toxins, an acetylene torch that can “cut through the hull of a battleship”, a forensic kit for analysing crime scenes, batarangs, a communication device, keys for the Batmobile, a rebreather in case Batman is ever submerged underwater, Batcuffs (special handcuffs designed to restrain even superpowered individuals), a lockpick, a high resolution camera and in some cases and the aforementioned grappling hook. In addition, the belt also contains numerous darts and pellets designed to subdue, incapacitate or otherwise stun criminals non-lethally when thrown. It also is variously shown to have a flamethrower, and EMP, a sonic devastator, remote claw, napalm, explosive gel, a cryptographic sequencer, and grenades of various type.
In the Batman and Robin film, the belt is even shown to contain a bat-credit card, which, if Batman is to be believed when he flashes it, is something he never leaves home without. And, to be honest, while this scene is often made fun of by the masses, it does at least accurately demonstrate a way for Batman to use his greatest super power- being rich.
In any event, as you might be gathering at this point, writers for Batman really do use his utility belt as a deus ex machina of sorts, usually introducing an amazingly specific gadget seemingly perfectly suited to solve whatever problem Batman has at a given time, with that gadget often never being mentioned again in later depictions.
In an effort to explain away their lazy writing in a semi-plausible way, the comic authors established in Batman canon that the hero obsessively plans every encounter to the most minute detail and has safeguards in place for any eventuality. Thus implying that the exact contents of his utility belt at any given time vary considerably from day to day, though even just going with the staple items that are supposedly always there, the storage capacity of this belt would give Hermione Granger’s handbag a run for its money.
Speaking of planning for any eventuality, the belt has numerous inbuilt security systems to prevent unauthorized use including a tracking beacon and an explosive charge so Batman can destroy it as a last resort if he ever loses it. The belt can also only be accessed by Batman and the various compartments and pouches will only open in response to a specific finger pattern.
The belt is also supposed to be constructed from a titanium alloy that makes it near indestructible, except, we guess from whatever explosive he used for its self destruct mode.
Of course, it’s at this point we feel compelled to point out that in the 1960s Batman TV show, early editions of his utility belt can very clearly be shown to be made up of common household kitchen sponges clipped to a yellow belt…
But to sum up, Batman’s superhero fanny pack contains a bafflingly array of equipment to fight crime, from shark repellent to kryptonite, that somehow all fits neatly into his tiny belt thanks to the magic of lazy comic writing.
Speaking of Batman’s obsessive planning, the comic JLA: Tower of Babel notes that Batman has plans in place to take out his own teammates, keeping detailed dossiers describing how to best deal with heroes such as Superman, Wonder Woman and the Flash. Batman’s obsession with being prepared for every scenario is such that he even keeps a file detailing how to kill himself should the need arise. For anyone curious, Batman notes that the easiest way to kill him would be to distract him by taking an innocent person hostage then take him out like any other mortal man. Although, given countless villains have used this exact strategy against him with little effect, we’re thinking maybe Batman’s planning abilities may be a little overestimated.
This article originally appeared on Today I Found Out. Follow @TodayIFoundOut on Twitter.
What happens when U.S. troops in Afghanistan take fire from Taliban fighters, fortified inside a building?
It’s pretty simple. Call in the Warthogs to bring on the BRRRRRT.
The BRRRRRT comes from the A-10’s GAU-8 Avenger cannon. The Avenger fires beer-bottle-sized 30 mm chunks of aluminum alloy at 3,342 feet per second.
More than one re-upload on the internet says the attack is from a Pakistani F-16, but the distinctive BRRRRRT from the GAU-8 is an unmistakeable sound.
So whatever this building is made of – concrete, cinderblocks, who knows – didn’t stand a chance. It’s no wonder everyone who calls in close air support and gets an A-10 gun run has the same reaction to the jaw-dropping power of the GAU.
The scenes of John Rambo wasting bad guys with an endless supply of ammunition isn’t so unrealistic after all.
While military blog Task and Purpose nailed it with its recent article on what military movies get wrong, the U.S. Army is actually fielding a new backpack that will give soldiers 500 rounds to fire downrange.
The Rapid Equipping Force (REF) has created the IRONMAN backpack, which bring soldiers closer to the infinite ammo Rambo status. It holds 500 rounds of ammo connected to a feeder that attaches directly to the M240B or Mark 48 machine gun. It eliminates the need for an ammunition bearer, although hiking with that much ammo could get pretty rough.
This video explains how the apparatus works, with the firing demonstration beginning at 5:00. Check it out:
The National Aeronautical and Space Administration has done very well with their small force of WB-57 Canberra reconnaissance planes. These planes have flown for nearly 60 years and they continue to serve today. With such a long, storied history, it’s easy to forget why the B-57 came to be in the first place. Let’s stroll down memory lane.
Originally, the B-57 Canberra was designed to be a light bomber that used high performance to avoid interception. The British started development of this plane in the latter years of World War II. While the American-produced versions did see some use as bombers during the Vietnam War, the Canberra truly hit its stride as a high-altitude reconnaissance asset for the Air Force.
The RB-57D Canberra variant was designed specifically for high-altitude recon missions.
The RB-57A was the first adaptation of the Canberra designed specifically for reconnaissance work, but the RB-57D was the first such plane intended to do so at high altitudes. Three versions of this recon jet were developed: One was for photo-reconnaissance, using advanced (for the time) camera, a second for electronic warfare, and a third that packed a powerful radar for mapping the ground.
The RB-57F, a much later version, which was created from re-manufacturing older Canberras. These souped-up planes featured more powerful engines and longer wings. They were able to operate at higher altitudes and were used for weather reconnaissance and to collect samples from nuclear tests.
This RB-57 started its life in the Air Force, and now flies with NASA as plane number 926.
Today, NASA still operates three B-57 Canberras. Whiles Canberras have now retired, a few are still flying in civilian hands, undertaking mapping missions.
Watch to video below to learn how the RB-57D was introduced to the United States.
Members of the U.S.-backed Syrian Democratic Forces (SDF), made up of an alliance of Arab and Kurdish fighters, inspect the Tabqa dam on March 27, 2017, which has been recently partially recaptured, as part of their battle for the jihadists’ stronghold in nearby Raqa.
Clashes raged around a key northern Syrian town on Tuesday after the Islamic State group launched a counter-attack to fend off a U.S.-backed advance near the jihadists’ stronghold Raqa.
Backed by air power from an international coalition bombing, the Syrian Democratic Forces are laying the groundwork for an assault on the heart of the jihadists’ so-called “caliphate.”
A key part of the campaign is the battle for the ISIS-held town of Tabqa on the Euphrates River, as well as the adjacent dam and military airport.
The SDF seized the Tabqa airbase late Sunday and began pushing north towards the town itself, but ISIS fighters doubled down on their defenses on Tuesday, the Syrian Observatory for Human Rights said.
“The fighting is a result of ISIS launching a counter-offensive to exhaust the Syrian Democratic Forces around the Tabqa military airport,” said Observatory head Rami Abdel Rahman.
He said the SDF was working to “consolidate its positions” near the airport ahead of a final push for the town.
SDF fighters are also bearing down on the Tabqa dam after capturing its northern entrance on Friday from ISIS fighters.
The fight around the structure has been backed by forces from the US-led coalition, with American-made armoured vehicles bearing the markings of the U.S. Marine Corps seen moving along a nearby road.
An AFP correspondent at the dam on Tuesday said it was generally quiet around the dam itself, despite the occasional ISIS-fired mortar that landed in SDF-controlled parts of the riverbank.
Airplanes could be heard humming above as SDF forces patrolled the northern entrance of the structure.
On Tuesday, coalition forces could be seen standing near military vehicles less than one mile from the dam, their mortar rounds casually stacked nearby.
After a brief pause in fighting on Monday to allow technicians to enter the dam complex, SDF fighters resumed their operations around the structure, said spokeswoman Jihan Sheikh Ahmed.
“ISIS amassed its fighters and attacked our forces in the area, which forced us to respond and resume the operations to liberate the dam,” she said.
Earlier this year, the United Nations raised concern about the prospect of damage to the dam in fighting, warning that water levels — which put pressure on the structure — were already high.
ISIS has also issued warnings through its propaganda agency Amaq that the dam “is threatened with collapse at any moment because of American strikes and a large rise in water levels”.
On Tuesday, technicians accompanied by the Syrian Arab Red Crescent could be seen examining the dam to assess whether water levels had risen in recent days.
“The explosions and the clashes are threatening the dam, and we ask for all sides to distance themselves from it,” said Ismail Jassem, an engineer from the SDF-controlled Tishreen Dam in neighbouring Aleppo province.
“The water levels are acceptable now. We came to open up one of the gates to relieve the pressure,” he told AFP.
The SDF launched its offensive for Raqa city in November 2016, seizing around two thirds of the surrounding province, according to the Britain-based Observatory.
At their closest point, the forces are just five miles from Raqa city, to the northeast.
But they are mostly further away, between ten to fifteen miles from Raqa.
The Observatory, which relies on a network of source on the ground in Syria, said ISIS had deployed around 900 fighters from Raqa city to various fronts in the wider province.
“Fighting is raging on every front around the city of Raqa, accompanied by non-stop air strikes,” Abdel Rahman said.
Syria’s conflict began with protests against President Bashar al-Assad in 2011 but has turned into a brutal war pitting government forces, jihadists, rebels, and Kurds against each other.
UN-mediated talks between government and rebel representatives continued Tuesday in Geneva, aimed at bringing an end to the war that has killed 320,000 people.
The attack helicopter has become a staple in many modern military forces. One country, though, has lagged a little bit with this crucial weapon: The People’s Republic of China. In fact, they were way behind the curve.
They really can only blame themselves: The June 1989 massacre of peaceful protestors at Tiananmen Square put the kibosh on acquiring a Western design, like the Augusta A129 or the Bell AH-1 Cobra. The fall of the Berlin Wall meant China lost out on buying the Mi-24 Hind. Communist China had to make do with arming the Harbin Z-9, a copy of the AS.365 Dauphin.
Now, however, China is catching up. The People’s Liberation Army took two approaches: One was to have the Russian helicopter company Kamov design a purpose-built anti-tank helicopter. The other was an effort to create a dedicated attack version of the Z-9, much like how the AH-1 Cobra was based off the famous UH-1 Iroquois utility helicopter.
Both of the projects are now reaching fruition, and it looks like the Chinese are going to use the products of each. The Z-10 is seen as the main attack helicopter, like the AH-64 Apache is for the United States, Israel, the United Kingdom, and a number of other countries.
The Z-19 is seen as more of an observation bird — albeit one with far more firepower than the retired OH-58 Kiowa. MilitaryFactory.com reports that it has a top speed of 152 miles per hour, a maximum range of 435 miles, is armed with up to eight anti-tank missiles, and has a crew of two. So far, only the Chinese Communists are using this helicopter — Pakistan, which is often a consumer of Chinese weapons, chose the Turkish copy of the A129 to fill its attack-helicopter needs.
Learn more about this helicopter in the video below: