Sentry Savannah 15
Senior Airman Rick Petcoff, Master Sgt. Rick Cornelison, Master Sgt. Wayne Gressman and Airman 1st Class Tanner Beckwith, 148th Fighter Wing, Duluth, Minn. work on a Block 50 F-16 during a Sentry Savannah training exercise, Feb 10, 2015, Savannah, Ga. The Sentry Savannah training exercise allows fighter pilots to participate in war simulations that depict what they would face in a real world scenario. (U.S. Air National Guard photo by Master Sgt. Ralph Kapustka/Released)