It used to be the CH-34 Choctaw (known as the sea horse in the Navy/Marines). By '65 it had been replaced by the UH-1 Iroquois (aka Huey). UH stands for Utility Helicopter; CH stands for Cargo Helicopter.
The world's FIRST (designed and built) attack helicopter was the AH-1 Cobra, deployed and combat tested in South Vietnam in '66. Both the Cobra and the Iroquois were built by the same company and both birds used the same engine.
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Ed "Too Tall" Freeman
Without question the most famous aspect of the Vietnam War was Helicopter Warfare. For the first time, the US Army created the AIRMOBILE Infantry Divisions (Helicopter). WW2 created the US Army's first AIRBORNE Infantry Divisions (Paratroopers).
Nearly 12,000 US helicopters & approximately 40,000 US helicopter pilots served in the Vietnam War. Over 5,000 US helicopters were destroyed and nearly 5,000 US helicopter crewmen were killed in Vietnam. Of those 5000 dead crewmen, about 2,000 were helicopter pilots.
Jet aces Ritchie, Olds, and Colonel George S. Patton.
No, the Vietnam War ended when the last US forces evacuated from the rooftop of the US embassy by helicopter. The South Vietnamese government soon fell and North Vietnam was victorious.