U.S. Secretary of the Navy Ray E. Mabus signs the guest book after an evening parade at Marine Barracks Washington, Washington, D.C., May 1, 2015. The parades, which are held Friday night during the summer months, are a means of honoring senior officials, distinguished citizens, and supporters of the Marine Corps. (U.S. Marine Corps photo by Lance Cpl. Kayla V. McTaw/Released)