The 6 most-secret units in military history

Secrecy is one of the best currencies in war, so it’s sometimes best for commanders to keep their best assets hidden from the enemy and the public. While the military has admitted that most of the units on this list existed at some point, a lot of their missions were classified for decades before being disclosed to the public. For the units that are still operating, America still only gets glimpses into their activities.

1. Task Force 88/Task Force Black

They may or may not be the same group and they may or may not still be in operation. Task Force Black and Task Force 88 are names floating around the media for the unit that conducted raids against terror organizations in Iraq and Afghanistan during the height of the wars. The unit was commonly described as being a joint U.S.-U.K. force made up of the best that SEAL Team 6, Delta Force, and the British SAS had to offer. Controversy erupted when they were blamed for a cross-border raid into Syria. There is speculation that Task Force Black may be back in operation to destroy ISIS, if it ever stopped.

2. 6493rd Test Squadron/6594th Test Group

JC-130 aircraft catching a falling canister of film during an air force mission

Photo: US Air Force

These Air Force units existed from 1958 to 1986 and were tasked with catching “falling stars.” They would fly out of Hawaii and catch film canisters falling from America’s first spy satellites. The satellites, part of the Corona program, orbited the Earth and took photos of Soviet Russia. Then, the satellites would drop their film canisters over the Pacific ocean where these Airmen would try to snatch the canisters out of the air.

The recovery process was surprisingly low-tech. A plane with a large hook beneath its tail would try to catch the canister’s parachute as it fell. When the planes failed to make the grab or the weather was too bad to attempt it, Coast Guard rescue swimmers in the unit would fish the film out of the water. The unit boasted a perfect record with more than 40,000 recoveries in 27 years. When its airmen weren’t snatching film from the air, the unit supported rescue missions near Hawaii. It was credited with 60 saves.

3. Delta Force/Combat Applications Group/Army Compartmented Elements

Delta Operators (maybe) during training with 160th SOAR

Photo: Department of Defense

Like many of the units on the list, Delta has gone through a few name changes over the years. Formation of an elite counter-terrorism unit had been proposed multiple times in the 1970s and Delta Force is widely believed to have been formed in late 1977. Its operational history got off to a horrible start with the failed Operation Eagle Claw in 1980. Since then, Delta has distinguished itself in combat from the invasion of Panama to the Gulf War to hunting Osama Bin Laden in the Tora Bora Mountains. Since the unit is still operational, many of their missions remain classified.

4. SEAL Team 6/DEVGRU

Navy Seal entering turret gunner position

Photo: Mass Communication Specialist 2nd Class Eddie Harrison

SEAL Team 6 specializes in counter terrorism, special reconnaissance, hostage rescue and close protection missions. Since 9/11, their budget and responsibilities have expanded to where they are now thought to have over 1,800 members, including some women who serve in intelligence roles. Perhaps most famous for both killing Osama Bin Laden and rescuing Captain Phillips from Somali pirates, it has been conducting combat operations since 1981.

READ MORE: 5 key differences between Delta Force and SEAL Team 6 >

5. 7781 Army Unit/39th Special Forces Operational Detachment

Army Unit 7781 Detachment Alpha west Berlin prepared to go undercover

Photo: Bob Charest

Operating in Berlin from 1956 to 1984, this team of green berets went through a few names during their history. They worked to keep West Berlin safe from communist incursions but also prepared to foment resistance if the city was taken over. Trained in classic spy craft skills, they were equipped with Bond-like gadgets such as cigarette-lighter guns and C-4 filled coal.

Master Sgt. Bob Charest, a retired former member of the unit, wrote for WATM about the unit.

6. The OSS

OSS World War II Wild Bill Donovan

Photo: US Office of Strategic Services

The Office of Strategic Services was formed in 1942 with the very broad mission of collecting and analyzing strategic information and conducting “special operations not assigned to other agencies.” Since few agencies had special operators in World War II, this gave the OSS a lot of room to run. Under Col. William “Wild Bill” Donovan, the tiny agency conducted raids, smuggled weapons and spies, supported resistance groups in Axis territory, and collected intelligence. The OSS even employed the first “sea, air, and land” commando in U.S. history.

NOW: The secret Air Force program that his an even more secret program >

OR: This is the FBI’s dream team of elite counterterrorism operators >

TOP ARTICLES
This is how John Kelly shut down speculation on President Trump's gold star family call

"If you're not in the family, if you've never worn the uniform, if you've never been in combat, you can't even imagine how to make that call," Kelly said.

Blumhouse and WATM team up to produce 'Searching for Bergdahl'

Blumhouse Television and WATM are teaming up to produce the documentary "Searching for Bergdahl," the untold story of the seven-year search for the missing soldier.

This is the real reason John McCain's Liberty Medal speech was so epic

When US media focused on a jab at President Trump, they missed the parting thoughts of a veteran and public servant of more than 60 years.

This little bot can take a lickin' and keep on tickin' for troops on assault

Weighing a little over five pounds, the FirstLook can handle being thrown into a hostile environment.

This is one of the deadliest kamikaze attacks caught on film

Japanese kamikaze pilots struck fear in the hearts of allied troops as they conducted choreographed nose-dives right into U.S. warships during WWII.

This is what it was like fighting alongside Afghan troops

In nearly every war in which America has taken part, troops have had to work alongside local forces who aren't always very motivated to fight.

This is how AC/DC helped save a POW in Mogadishu

The ending of "Black Hawk Down" was just slightly different than Ridley Scott showed. It was a moment former POW Mike Durant would never forget.

Russia is buying more of these 'Fullback' fighter jets — and they're pretty impressive

The Russian Ministry of Defense says it just got four more SU-34 bombers, and they're impressive AF. We have the details and video for you here.

More than 100 killed in Taliban attacks across Afghanistan

The Afghan Defense Ministry is reporting over 100 Afghan deaths in October. The Taliban killed Afghan police officers and soldiers, and civilians.

The US Navy just launched an effort to built this is the super-stealthy submarine

The USS South Dakota — a Block-III Virginia Class attack submarine — has officially been christened. We have the details and how it compares to its peers.