collective-history:

Paratroopers of the U.S. 2nd Battalion, 173rd Airborne Brigade hold their automatic weapons above water as they cross a river in the rain during a search for Viet Cong positions in the jungle area of Ben Cat, South Vietnam on Sept. 25, 1965. (AP Photo/Henri Huet) 
vietnamwarera:

Bell UH-1B “Huey”
The UH-1B performed primarily gunship duties earlier in the war, before being replaced by the Bell AH-1 “Cobra”.
collective-history:

A Bell UH-1D helicopter piloted by Major Bruce P. Crandall climbs skyward after discharging a load of U.S. infantrymen on a search and destroy mission