U.S. Vice President Dick Cheney (front) is pictured with senior staff in the President’s Emergency Operations Center in Washington in the hours following the September 11, 2001 attacks in this U.S National Archives handout photo

U.S. Vice President Dick Cheney (front) is pictured with senior staff in the President’s Emergency Operations Center in Washington in the hours following the September 11, 2001 attacks in this U.S. National Archives handout photo obtained by Reuters July 24, 2015. REUTERS/U.S. National Archives/Handout via Reuters