During the Vietnam War, the US created a highly classified unit that still influences modern special operations
Stavros Atlamazoglou
US Air Force Bell UH-1P helicopters from the 20th Special Operations Squadron fly into Cambodia, around 1970.
As the US waged a conventional war in South Vietnam, a group of special operators carried out a secret war inside and outside the country.
The Military Assistance Command Vietnam-Studies and Observations Group, as their unit was known, was disbanded after the war, but it had a lasting influence on modern US special operations forces.
As the US's involvement in Vietnam steadily grew with more conventional troops, so did its secret war.