Master Sgt. Brian Johnson (right) and 2nd Lt. Sherry Ferno, both of the 176th Security Forces Squadron, stand guard at the memorial display for Sitka 43 during the Arctic Thunder Air Show July 31, 2010, at Joint Base Elmendorf-Richardson, Alaska. Four aviators were killed when their C-17 Globemaster III, call sign Sitka 43, crashed July 28 as they practiced for the air show. (U.S. Army photo/John Pennell)