Pvt. John Hubbard of the 3rd U.S. Infantry Regiment places American flags at the graves of U.S. soldiers.
A man visits the Vietnam Memorial Wall in Washington, DC.
Mackenzie Griffith, 3, decorates a grave with a flag in honor of Memorial Day.
John Ryan, of Oriskady, N.Y., places roses at the grave of a soldier he did not know on Memorial Day at Arlington National Cemetery.
Ret. Air Force Maj. Alfred Nathaniel Simmons lines up with other members of the Veterans of Foreign Wars honor guard at Memorial Day Observance.
Vietnam Veterans Memorial Wall.
Camp mentor Billy Marlow and Ian Crowell, 7, who’s father MSG Thomas Crowell was killed by a roadside bomb in Iraq in 2007, visit the Korean War Memorial on the National Mall in Washington, DC.
Tom Azuma pays respects to the grave of his foster father Eric Norton.
American Robert Dryfoos, left, from Conn., with Khalil Diallo walks around layers of tombs after attending Memorial Day rites at the American Cemetery in Manila, Philippines.
Soldiers pass the grave of US Army Lt. Thomas Brown, who served in Iraq and died in 2008.
A young boy looks at a wall with engraved names of soldiers who fell during World War II at the Manila American Cemetery in Fort Bonifacio in the Philippine capital Manila on May 27, 2012.
Matthew Russell, 11, from Memphis prepares to place American flags at the headstones of veterans during the Memorial Day observance ceremony at the Memphis National Cemetery in Memphis, Tenn.
Donald Stewart, of Somerset, N.J., stands next to his wife, Betty Stewart, at the grave of her son, U.S. Navy veteran Twain S. Bryant.
A wreath at the grave of an unknown Union soldier who died during the Civil War.
US Air Force Major Terry Dutcher lays at the grave of her son, US Army Cpl. Michael Avery Pursell.
- BuzzFeed News has identified a second member of the ISIS execution cell led by "Jihadi John."