U.S. Air Force Senior Airman Colleen Corrigan, from the 144th Fighter Wing, California Air National Guard, marshals an F-16 Fighting Falcon aircraft on Hickam Air Force Base, Hawaii, before an air-to-air mission during exercise Sentry Aloha Sept. 18, 2009. The exercise brings dissimilar combat assets to Hickam AFB to train with the Hawaii Air National Guard's 199th Fighter Squadron. (U.S. Air Force photo by Staff Sgt. Charles P. Vaughn) (Released)