This O-2A was delivered directly from the Cessna factory to the 504th TASG at Da Nang AB, Vietnam in August 1967, the unit moving to Cam Rahn Bay AB In September 1970. The aircraft returned to the US in March 1971 serving with various Air National Guard units before arriving with the 602nd TCW at Davis-Monthan AFB for operation till withdrawal from use in March 1980. It was flown to the museum in 1986

Warner Robins Air Logistics Center supported the USAF O-2 fleet by managing all the avionics and gun systems used on the aircraft. 'Big Herb' was delivered to the 504th TAS Group at Da Nang AB, Vietnam in Aug. 1967. It returned to the US in March 1971 serving with various ANG Units before arriving at its final unit before USAF retirement, the 602nd Tactical Control Wing at Davis-Monthan AFB, AZ. The aircraft was SOC service in March 1980 and flown to the Museum of Aviation in 1986.