8/2/2010 - 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)

8/2/2010 - Three-year-old Emmett Parkison leaves a bundle of flowers at the memorial display set up at the Arctic Thunder Air Show July 31, 2010, at Joint Base Elmendorf-Richardson, Alaska, for four aviators killed July 28 in the crash of a C-17 Globemaster III, call sign Sitka 43. (U.S. Army photo/John Pennell)

8/2/2010 - A family attending the Arctic Thunder Air Show July 31, 2010, at Joint Base Elmendorf-Richardson, Alaska, pauses in front of the memorial display for four aviators killed July 28 in the crash of a C-17 Globemaster III, call sign Sitka 43. (U.S. Army photo/John Pennell)