Clark Air Base is a Philippine Air Force base on Luzon Island in the Philippines, located 3 miles (4.8 km) west of Angeles City, and about 40 miles (64 km) northwest of Metro Manila. Clark Air Base was previously a United States military facility, operated by the U.S. Air Force under the aegis of Pacific Air Forces (PACAF) and their predecessor organizations from 1903 to 1991. The base covered 14.3 square miles (37 km2) with a military reservation extending north that covered another 230 square miles (600 km2).

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.