Osan Air Base, is a United States Air Force base located near Songtan Station in the city of Pyeongtaek, South Korea, 64km south of Seoul. Despite its name, Osan AB is not within Osan City, which is 7.5km to the north. The base is the home of the Pacific Air Forces' 51st Fighter Wing, and a number of tenant units, including the headquarters for Seventh Air Force. The base is also the headquarters of the ROK Air Force Operations Command. Osan Air Base is also the departure and arrival point for U.S. government-contracted "Patriot Express" flights bringing service members and their family members to South Korea from Seattle-Tacoma International Airport in the U.S. state of Washington, Misawa Air Base and Yokota Air Base in Japan.As the most forward deployed permanently based wing in the Air Force, and equipped with A-10 Thunderbolt IIs and F-16 Fighting Falcons, the 51st Fighter Wing is charged with executing combat operations, receiving follow-on forces and defending the base from attack. As the air component to United States Forces Korea and Combined Forces Command, 7th Air Force provides the command and control structures and personnel necessary to deliver precise, persistent, combined air and space power in defense of the Republic of Korea.