The USAF component of the U.S. Pacific Command was PACAF. Seventh Air Force, another Numbered Air Force of PACAF was headquartered at Tan Son Nhut Air Base, South Vietnam, although the Seventh controlled many units based in Thailand. Thai sensitivities about units based in Thailand reporting to a headquarters in South Vietnam caused a shift whereby the Seventh Air Force was ostensibly subordinate to Thirteenth Air Force for administrative matters (and therefore referred to as Seventh/Thirteenth Air Force). The commander, Seventh Air Force, played a dual role as MACV's deputy for air operations.