Vietnam was the first conflict in which helicopters played a major role in most operations, from the lifting outsized objects, to close support of troops, to the rescue of downed air crews, to provision of supplies, to the evacuation of casualties.
Bell UH-1B and UH-1C Hueys, known as "Hogs", performed helicopter gunship duties for the U.S. Army during the early years of the Vietnam War.
In Vietnam, the U.S. Army 1st Cavalry Division was assigned a role that was completely new in military history, as the first unit dedicated to helicopter airmobile missions.
Utility helicopters were the linchpin of air assault tactics in Vietnam and their protection was a vital requirement. This led to the creation of the AH-1 Cobra gunship.
The 119th Assault Helicopter Company operated throughout the Central Highlands, providing helicopter support for American and South Vietnamese conventional and special operations units in in Laos and Cambodia.
In Vietnam, Hughes OH-6 Cayuse helicopters served in huge numbers. They served in light observation and utility roles and, when paired with helicopter gunships, in "hunter-killer" missions.