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Arlington National Cemetery (Arlington, Va.)
American flags adorn the graves of U.S. soldiers buried at Arlington National Cemetery in this 2015 photo. "Flags-In" has become an annual ceremony since the 3rd U.S. Infantry Regiment (The Old Guard) was designated to be an Army's official ceremonial unit in 1948.
Win McNamee/Getty Images
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National Memorial Arch (Valley Forge, Pa.)
The National Memorial Arch sits in the center of Valley Forge Military Academy's park.
Douglas Grundy/Getty Images
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Korean War Memorial (Washington, DC)
The Korean War Memorial sits on the National Mall. "Our nation honors her sons and daughters who answered the call to defend a country they never knew and a people they never met," reads inscription at the site.
SAUL LOEB/AFP/Getty Images
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Tomb of the Unknown Soldier (Arlington, Va.)
A member of the US Army Honor Guard stands at the Tomb of the Unknown Soldier at Arlington National Cemetery.
PAUL J. RICHARDS/AFP/Getty Images
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Vietnam Veterans Memorial (Washington, DC)
At the Vietnam Veterans Memorial on the National Mall, the names of more than 58,000 names of US military members who died in the Vietnam War are engraved on the wall.
SAUL LOEB/AFP/Getty Images
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US Marine Corps Memorial
Sunrise peeks around the edge of the U.S. Marine Corps Memorial in Arlington, Va. on Friday, Oct. 18, 2013. (AP Photo/J.David Ake)
J. David Ake/AP
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NATIONAL D DAY MEMORIAL
The National D-Day Memorial in Bedford, Va., is shown Thursday, May 25, 2000. The memorial honors D-Day veterans, especially the 19 men from Bedford who lost their lives June 6, 1944, during the allied invasion of Normandy during World War II. (AP Photo/Andres R. Alonso)
ANDRES R. ALONSO/ASSOCIATED PRESS
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US-WWII-PEARLHARBOR-COMMEMORATION
An military honor guard presents the colors during a ceremony marking the 74th anniversary of the attack on Pearl Harbor at the World War II Memorial in Washington, DC, December 7, 2015. AFP PHOTO / SAUL LOEB / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
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U.S.S. Arizona (Pearl Harbor, Hawaii)
U.S.S. Arizona survivor Louis Conter salutes the remembrance wall of the vessel during a memorial service in 2014. On the morning of December 7, 1941, a surprise military attack was conducted by aircraft of the Imperial Japanese Navy against the U.S. Pacific Fleet being moored in Pearl Harbor, marking the entry of the U.S. in World War II.
Kent Nishimura/Getty Images
