General Hansen served in Vietnam starting in May 1968 as commander, 3d Tactical Fighter Wing, Bien Hoa Air Base. In May 1969 he was appointed director, Tactical Air Control Center, Headquarters Seventh Air Force, Tan Son Nhut Airfield. During his Vietnam tour he flew 230 combat missions in F-100, F-4 and A-37 aircraft.
In November 1967 Tran Van Minh was promoted to Brigadier-General and commander of the VNAF (South Vietnam Air Force) and to Major-General in 1968. Minh would be the longest-serving commander of the VNAF holding command from 1967 until the Fall of Saigon in April 1975 where he was evacuated and live in the US until his death in 1997.