"The Huey first saw combat in Vietnam during 1962. After initial use for medevac
as planned, the helicopter was soon adapted to be a highly efficient trooptransporter
(‘Slick’), and the idea of‘air assault’ was born.
In a conflict with no established front-lines, helicopters were crucial in taking the fight to the enemy.
New divisions were created and existing ones were equipped with the revolutionaryhelicopter.
The 1st Air Cavalry became the 1st Air Cavalry ‘Airmobile’ and, together with the legendary 101st
Airborne Division, they developed advanced tactics for helicopter assault and counter-insurgency warfare."
Source: http://conflictarchaeology1.files.wordpress.com/2011/12/the-huey-helicopter-and-the-vietnam-war.pdf