Photo showing, September 18, 1965 - Bien Hoa, South Vietnam: Helicopters, carrying members of the U.S. 173rd Airborne Brigade, fire on a Viet Cong position as they prepare to land about eight miles from Bien Hoa. This was the Brigade's first jungle operation since its arrival in South Vietnam.

Bell UH-1 Iroquois “slicks” transport elements of the 173rd Airborne Brigade to their first operation 8 miles from Bien Hoa, Vietnam, while other Hueys, armed with machine guns and rockets, plaster a suspected Viet Cong position on Sept. 18, 1965. (Bettmann (Getty Images))

Bettmann (Getty Images)