Guests watch the U.S. Marine Corps Drum and Bugle Corps as they perform during a sunset parade at the Marine Corps War Memorial, Arlington VA, June 30, 2015. The Honorable Mr. Ashton B. Carter, Secretary of Defense, was the guest of honor for the parade, and Gen. Joseph F. Dunford Jr., commandant of the U.S. Marine Corps, was the hosting official. Since September 1956, marching and musical units from Marine Barracks Washington, D.C., have been paying tribute to those whose “uncommon valor was a common virtue” by presenting sunset parades in the shadow of the 32-foot high figures of the United States Marine Corps War Memorial. (U.S. Marine Corps photo by Lance Cpl. Alex A. Quiles)