A caisson carries the casket of Army Spc. 5 John L. Burgess to its burial plot at Arlington National Cemetery, 43 years after he was killed in Vietnam. Among those at Tuesday’s ceremony was his 44-year-old son, who was not yet 2 when his father died. (Associated Press)
Attorney General Eric Holder attends the 50th anniversary remembrance ceremony for slain civil rights activist Medgar Evers, Wednesday, June 5, 2013, at Arlington National Cemetery in Arlington, Va. (AP Photo/Susan Walsh)
President Barack Obama, center, participates in the wreathlaying ceremony at the Tomb of the Unknowns with Maj. Gen. Michael S. Linnington, left, Commander of the U.S. Army Military District of Washington, at Arlington National Cemetery on Memorial Day, May 27, 2013, in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama talks with Secretary of Defense Chuck Hagel, center, as Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, left, looks on as they wait to deliver their Memorial Day remarks at Arlington National Cemetery in Arlington, Va., Monday, May 27, 2013. (AP Photo/Cliff Owen)
A woman grieves at the grave site of a loved one on Memorial Day at Arlington National Cemetery in Arlington, Va., Monday, May 27, 2013. (AP Photo/Molly Riley)
U.S. Marine Corps, 2nd Lt. Adam Carroll, left, pays tribute as he salutes during the playing of the National Anthem at the Memorial Day ceremony in the Memorial Amphitheater at Arlington National Cemetery Monday, May 27, 2013, in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, center, participates in the wreathlaying ceremony at the Tomb of the Unknowns with Maj. Gen. Michael S. Linnington, left, Commander of the U.S. Army Military District of Washington, at Arlington National Cemetery on Memorial Day, May 27, 2013, in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama talks with Secretary of Defense Chuck Hagel, center, as Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, left, looks on as they wait to deliver their Memorial Day remarks at Arlington National Cemetery in Arlington, Va., Monday, May 27, 2013. (AP Photo/Cliff Owen)
A woman grieves at the grave site of a loved one on Memorial Day at Arlington National Cemetery in Arlington, Va., Monday, May 27, 2013. (AP Photo/Molly Riley)
U.S. Marine Corps, 2nd Lt. Adam Carroll, left, pays tribute as he salutes during the playing of the National Anthem at the Memorial Day ceremony in the Memorial Amphitheater at Arlington National Cemetery Monday, May 27, 2013, in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama participates in the wreath-laying ceremony at the Tomb of the Unknowns at Arlington National Cemetery on Memorial Day, May 27, 2013, in Arlington, Va. (AP Photo/Pablo Martinez Monsivais)
Ensign Donald P. Frye, 23, of Los Angeles; will be buried as a group with full military honors on Thursday in Arlington National Cemetery following an extended effort to recover their remains that began in 1982. (image from US Navy/Militarygear.com)
President Barack Obama and Vice President Joe Biden place a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)
While at Arlington National Cemetery for Veterans Day ceremonies, President Obama and first lady Michelle Obama visited Section 60, the site where many of America's most recent war dead from the Afghanistan and Iraq conflicts are buried, in Arlington, Va., Sunday, Nov. 11, 2012. (AP Photo/J. Scott Applewhite)
President Obama presents a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., during a Veterans Day ceremony on Nov. 11, 2012. (Associated Press)