U.S. Air Force Staff Sgt. Greg Penrod, 20th Aircraft Maintenance Squadron, Shaw Air Force Base, S.C., crew chief, performs post flight exhaust inspection on a 77th Fighter Squadron F-16 Fighting Falcon, June 14, 2012, during Red Flag-Alaska at Eielson AFB, Alaska. Red Flag-Alaska is a Pacific Air Forces-sponsored, joint/coalition, tactical air combat employment exercise which corresponds to the operational capability of participating units. The entire exercise takes place in the Joint Pacific Range Complex over Alaska as well as a portion of Western Canada for a total airspace of more than 67,000 square miles.