Participants applaud U.S. President Barack Obama (C) as he rises to deliver remarks at the Memorial Day observance at Arlington National Cemetery in Arlington, Virginia May 25, 2015. Also pictured are Chairman of the Joint Chiefs of Staff U.S. Army General Martin Dempsey (L), U.S. Defense Secretary Ash Carter (2nd L), U.S. Army Military District of Washington Commanding General Jeffrey Buchanan (2nd R) and U.S. Army Chaplain Gary Studniewski (R). REUTERS/Jonathan Ernst