The Fifth Air Force is a numbered air force of the United States Air Force Pacific Air Forces (PACAF). It is headquartered at Yokota Air Base, Japan. It is the U.S. Air Force's oldest continuously serving Numbered Air Force. The organization has provided 80 years of continuous air power to the Pacific since its establishment in September 1941.

The Pacific Air Forces (PACAF) is a Major Command (MAJCOM) of the United States Air Force and is also the air component command of the United States Indo-Pacific Command (USINDOPACOM). PACAF is headquartered at the Hickam AFB portion of Joint Base Pearl Harbor–Hickam, Hawaii, and is one of two USAF MAJCOMs assigned outside the Continental United States, the other being the United States Air Forces in Europe – Air Forces Africa. Over the past sixty-five plus years, PACAF has been engaged in combat during the Korean and Vietnam Wars and Operations Desert Storm, Southern Watch, Northern Watch, Enduring Freedom and Iraqi Freedom.