Soldiers from the 3rd U.S. Infantry Regiment, the Old Guard, place flags in front of every grave at Arlington National Cemetery in Arlington, Va., on Thursday, May 22, 2014. (Mike Morones/Staff)

Soldiers from the 3rd U.S. Infantry Regiment, the Old Guard, place flags in front of every grave at Arlington National Cemetery in Arlington, Va., on Thursday, May 22, 2014. (Mike Morones/Staff)

Click here to see the Military Times Arlington National Cemetery sesquicentennial tribute by staff photographer Mike Morones.