President Obama and first lady Michelle Obama visit Section 60 of Arlington National Cemetery and place Challenge Coins on tombstones on Tuesday, Sept. 11, 2012. (AP Photo/Carolyn Kaster)
Row upon row of white marble monuments at Arlington National Cemetery honor military veterans. More than 400,000 graves line up on its 624 acres, which also hold the Tomb of the Unknowns and the grave of John F. Kennedy. (The Washington Times)
Members of the Air Force Honor Guard hold American flags to be presented to family members during a burial service July 9, 2012, at Arlington National Cemetery in Arlington, Va., for six men killed in 1965 when an Air Force plane carrying the men crashed after leaving Vietnam for a combat mission.
U.S. Secretary of Defense Leon Panetta visits grave sites on Memorial Day at Arlington National Cemetery in Arlington, Va., Monday, May 28, 2012. (Rod Lamkey Jr/The Washington Times)
A girl walks past the rows of headstones, using an umbrella for shade on Memorial Day at Arlington National Cemetery. (Rod Lamkey Jr/The Washington Times)
A family who did wish to give their names kneel before a headstone on Memorial Day at Arlington National Cemetery. (Rod Lamkey Jr/The Washington Times)
Family members raise a toast in memory of U.S. Army First Lieutenant Kenneth M. Ballard at his grave site on Memorial Day at Arlington National Cemetery. (Rod Lamkey Jr/The Washington Times)
A girl places a rose at the headstone of U.S. Army Captain Ian Patrick Weikel on Memorial Day at Arlington National Cemetery. (Rod Lamkey Jr/The Washington Times)
Karen Clarkson, of Fairbanks, Alaska, kisses the headstone of her son U.S. Army Sergeant Joel Clarkson on Memorial Day at Arlington National Cemetery in Arlington, Va., Monday, May 28, 2012. (Rod Lamkey Jr/The Washington Times)
President Barack Obama, right, Defense Secretary Leon Panetta, center, and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, stand during the singing of the National Anthem at the Memorial Day Observance at the Memorial Amphitheater at Arlington National Cemetery, Monday, May 28, 2012. (AP Photo/Charles Dharapak)