In late 1966 the USAF selected a military variant of the Cessna Model 337 Super Skymaster to supplement the O-1 Bird Dog FAC aircraft. The O-2A Skymaster identified and marked enemy targets with smoke rockets, co-ordinated air strikes and reported target damage. This O-2A was assigned to the 20th TAS Squadron at Da Nang, South Vietnam in the late 1960s and is now on display at the National Museum of the USAF.