A U.S. Air Force F-16C Fighting Falcon aircraft assigned to the 144th Fighter Wing, California Air National Guard, taxies out of the flight line at Hickam Air Force Base, Hawaii, while participating in Exercise Sentry Aloha Sept. 17 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)