Army Capt. Nicholas Stout places a small American flag in front of a grave in Arlington National Cemetery, Va., May 23. Nearly 1,200 soldiers from The Old Guard placed flags in front of more than 260,000 gravestones and approximately 7,300 niches at the cemetery's columbarium. (U.S. Army Photo by Sgt. (Luisito Brooks/Courtesy of the U.S. Army)

Soldiers of the 3rd U.S. Infantry Regiment (The Old Guard), march into Arlington National Cemetery, May 23, in preparation for "Flags In." (Jose Torres Jr./Courtesy of the U.S. Army)

Sgt. Titus Fields places an American flag in front of a grave stone in Arlington National Cemetery on May 23. This tradition, known as "Flags In," has been conducted annually since The Old Guard was designated as the Army's official ceremonial unit in 1948. (Jose A. Torres Jr./Courtesy of the U.S. Army)

Spc. Brock Bowers renders honors to Medal of Honor recipient Sgt. Dwight H. Johnson after placing a flag on his grave during "Flags In" in Arlington National Cemetery. (Luisito Brooks/Courtesy of the U.S. Army)

Each year for the past 65 years, members of the 3d U.S. Infantry (The Old Guard) has honored America's fallen heroes by placing American flags before the gravestones and niches of Service members buried at both Arlington National Cemetery and the U.S. Soldier's and Airmen's Home National Cemetery just prior to Memorial Day weekend. (Jose Torres Jr./Courtesy of the U.S. Army)

The clouds were threatening, but the weather held while Old Guard Soldiers planted flags at Arlington National Cemetery. (Courtesy of the U.S. Army)