Memorial Day 2016

President Barack Obama places a wreath at the Tomb of the Unknown Soldier during a Memorial Day ceremony at Arlington National Cemetery in Arlington, Va., May 30, 2016. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz

Defense Secretary Ash Carter talks with participants of the Rolling Thunder motorcycle ride at the start of the event at the Pentagon, May 29, 2016. The annual ride aims to raise awareness for prisoners of war and U.S. service members missing in action. DoD photo by Army Sgt. First Class Clydell Kinchen

Defense Secretary Ash Carter kicks off the 29th Rolling Thunder "Ride for Freedom" at the Pentagon's north parking lot, May 29, 2016. The annual demonstration, held the day before Memorial Day, pays tribute to prisoners of war and Americans missing in action. DoD photo by Army Sgt. 1st Class Clydell Kinchen

Rolling Thunder participants gather at the Pentagon's north parking lot, May 29, 2016. Started by two Vietnam War veterans, the annual demonstration ride brings together veterans of all eras and others seeking to pay respects to those who have served. DoD photo by Army Sgt. 1st Class Clydell Kinchen

Defense Secretary Ash Carter gives one of his coins to a young bystander attending the Rolling Thunder demonstration ride at the Pentagon's north parking lot, May 29, 2016. DoD photo by Army Sgt. 1st Class Clydell Kinchen

Defense Secretary Ash Carter speaks with Bonnie Carroll, president of the Tragedy Assistance Program for Survivors, or TAPS, while welcoming more than 350 TAPS members to the Pentagon, May 27, 2016, for a night of fun and remembrance to coincide with Memorial Day weekend. TAPS offers support to people who have lost a family member serving in the military. DoD photo by EJ Hersom

Children pet a horse belonging to the Army during an event for members of the Tragedy Assistance Program for Survivors, or TAPS, at the Pentagon, May 27, 2016. TAPS supports people who have lost a family member serving in the military. DoD photo by EJ Hersom

Soldiers place American flags in front of headstones during "Flags In" at Arlington National Cemetery in Arlington, Va., May 26, 2016. The soldiers are assigned to the 3rd U.S. Infantry Regiment, known as "The Old Guard." Soldiers assigned to the regiment placed approximately 230,000 flags during the event, with each of the cemetery's headstones receiving a flag for the Memorial Day holiday. Army photo by Rachel Larue

Air Force Staff Sgt. Steven Price attaches American flags to light poles on Stewart Avenue to commemorate Memorial Day at Peterson Air Force Base, Colo., May 23, 2016. Price is a structural journeyman assigned to the 21st Civil Engineer Squadron. He placed around 130 flags along the base’s main roads before the holiday weekend. Air Force photo by Staff Sgt. Amber Grimm

Brittany, left, and her son, Christian, 4, spend time at the grave of her husband and his father, Marine Corps Sgt. Christopher Jacobs, in Section 60 of Arlington National Cemetery in Arlington, Va., May 25, 2015. Christian wore his father’s cover during the Memorial Day visit. Army photo by Rachel Larue

Wounded warrior Romulo Camargo, a retired Army chief warrant officer, and his family listen to the 26th National Memorial Day Concert at the U.S. Capitol in Washington, D.C., May 24, 2015. The concert included musical performances, documentary footage and dramatic readings to honor the fallen and comfort the grieving. DoD photo by Navy Petty Officer 1st Class Daniel Hinton

Soldiers walk across a field of 6,800 memorial lights, which represent U.S. service members who have fallen in Iraq and Afghanistan, during a Memorial Day vigil on Camp Buehring, Kuwait, May 26, 2014. Army photo by Sgt. Marcus Fichtl

Navy Petty Officer 3rd Class Shelby Tucci, assigned to the Pacific Fleet Band, salutes after playing taps at the USS Arizona Memorial during a National Park Service sunset tour at Joint Base Pearl Harbor-Hickam, Hawaii, May 26, 2014. Navy photo by Petty Officer 1st Class Daniel Barker

Air Force Master Sgt. Tiffany Robinson kneels in front of a battlefield cross following a Memorial Day ceremony at Camp Lemonnier, Djibouti, May 26, 2014. Robinson is assigned to 449th Air Expeditionary Group. The cross was created with combat gear representing each of the five U.S. military branches to commemorate fallen service members. Navy photo by Petty Officer 1st Class Eric Dietrich

Air Force Senior Airman Jerick Encarnacion, left, holds a flag during a Memorial Day candle vigil march at Bagram Airfield, Afghanistan, May 26, 2014. Encarnacion is assigned to the 455th Expeditionary Logistics Readiness Squadron. Air Force photo by Staff Sgt. Evelyn Chavez

A soldier from the 3rd U.S. Infantry Regiment, known as "The Old Guard," leads a riderless horse during the Memorial Day parade in Washington, D.C., May 27, 2013. The riderless horse carries a soldier's boots reversed in the stirrups. Army photo by Staff Sgt. Teddy Wade

Retired Army Command Sgt. Maj. Sterling R. Cale, a 90-year-old Pearl Harbor survivor, takes a moment in the shrine room of the USS Arizona Memorial at Joint Base Pearl Harbor-Hickam, Hawaii, May 27, 2012, during a ceremony to honor the 1,177 service members who lost their lives during the attack on the USS Arizona on Dec. 7, 1941. Air Force photo by Tech. Sgt. Michael Holzworth