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Attendees of the RAIDR 21 memorial ceremony gather around the RAIDR 21 monument July 21, 2017, in Adelup, Guam. The monument honors the six B-52 Stratofortress crew members who lost their lives during a training mission July 21, 2008. The six aviators, from the 20th Expeditionary Bomb Squadron, were slated to participate in a flyover for Guam's Liberation Day Parade. (U.S. Air Force photo by Airman 1st Class Gerald R. Willis)