 At Holloman, the wing began converting to the new F-4C Phantom II in February 1965.Later that year, the wing sent its first squadron to the Republic of Vietnam.The 390th Fighter Squadron was deployed to Da Nang Air Base (6252d Tactical Wing) in October 1965, and the 391st went to Cam Ranh Bay Air Base (12th Tactical Fighter Wing) in January 1966.