Tech. Sgt. Gerardo Guevara waits for F-16 Fighting Falcons to shut down their engines before conducting post-flight checks at Hickam Air Force Base, Hawaii, Sept. 8. Six F-16s from the Texas Air National Guard's 149th Fighter Wing came to Hickam AFB to participate in Exercise Sentry Aloha. Sergeant Guevara is a maintainer from the 149th FW. (U.S. Air Force photo/Tech. Sgt. Shane A. Cuomo)