The 140th Wing (140 WG) is a unit of the Colorado Air National Guard, stationed at Buckley Space Force Base, Aurora, Colorado. If activated to federal service, the Wing is gained by the United States Air Force Air Combat Command. The 140th Wing flies F-16C/D/ Falcons and C-21 Learjet. It also carries out 137th Space Warning Squadron (Air Force Space Command) and Civil Engineering (Pacific Air Forces) missions. It has over 1200 personnel.