Block 50, F-16's, 148th Fighter Wing, Duluth, Minn. stand ready for the next mission during a Sentry Savannah 15-1 training exercise, Feb 11, 2015, Savannah, Ga. Sentry Savannah 15-1 provides traditional Airmen wartime readiness training in an unfamiliar environment in an economical, accelerated timeframe. (U.S. Air National Guard photo by Master Sgt. Ralph Kapustka/Released)