The Cessna O-2A was flown by a number of RNZAF pilots seconded to the United States Air Force (USAF) in South Vietnam.

The O-2A was commissioned by the USAF in 1966 and developed as a forward air control (FAC) aircraft. It entered production in 1967 and went straight into operational service in the Vietnam War. With none of their own combat aircraft deployed to South Vietnam, the RNZAF sent 14 pilots to be attached to the USAF as forward air controllers between December 1968 and February 1972. FACs were responsible for carrying out visual reconnaissance, marking targets on the ground, and calling in and controlling attacks by strike aircraft.