Memorial Day observed across the United States (23 images)

Christian Jacobs, 5, adjusts his hat as he visits the grave of his father Marine Sgt. Christopher Jacobs at Arlington National Cemetery on Memorial Day in Arlington, Va., on May 30, 2016. Jacobs died in a training exercise in 2011. Photo by Kevin Dietsch/UPI

U.S.President Barack Obama (L) arrives to lay a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery, Arlington, Va., on Memorial Day, May 30, 2016, near Washington, D.C. Obama paid tribute to the nation's military service members who have fallen. Photo by Mike Theiler/UPI

Army Maj. John Dabolt mourns at the grave of Army Staff Sgt. Gavin Reinke at Arlington National Cemetery on Memorial Day in Arlington, Va., on May 30, 2016. Photo by Kevin Dietsch/UPI

Members of the Amercian Gold Star Mothers, pause as an American flag passes during the beginning of a Memorial Day Service at Jefferson Barracks National Cemetery in St. Louis on May 30, 2016. Photo by Bill Greenblatt/UPI