WATCH: Military Does Baby Shark Cadence

ARLINGTON, VA – MAY 26: Members of the 3rd U.S. Infantry Regiment place American flags at the graves of U.S. soldiers buried at Arlington National Cemetery in preparation for Memorial Day May 26, 2011 in Arlington, Virginia. “Flags-In” has become an annual ceremony since the 3rd U.S. Infantry Regiment (The Old Guard) was offered to be an Army’s official ceremonial unit in 1948. Every available soldier in the 3rd U.S. Infantry Regiment participates in these events. (Photo by Win McNamee/Getty Images)