Members of the 3rd Infantry Regiment – Commander-in-Chief’s Guard, from Fort Myer, Va., demonstrate the square battle formation used during the revolutionary war era in Yorktown, Va., as part of the annual Yorktown Day celebration, Oct. 19, 2012. The day’s events were held to celebrate the success of Gen. George Washington and the Continental Army at Yorktown in 1781. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth / Released)