U.S. Air Force Airman 1st Class Nelson A. Walker, assigned to the 9th Air Support Operations Squadron, observes an A-10 Thunderbolt II aircraft May 22, 2014, at the Joint Multinational Readiness Center in Hohenfels, Germany, during a live-fire operation as part of Combined Resolve II. Combined Resolve II is a U.S.-led combined arms exercise designed to prepare U.S. and European forces for multinational operations.
(DoD photo by Staff Sgt. Amanda Nall, U.S. Army National Guard/Released). Original public domain image from Flickr