Secretary of Defense Chuck Hagel, left, shares a laugh with U.S. Air Force Gen. C. Robert Kehler, second from left, and members of Kehler's family Nov. 15, 2013, after a U.S. Strategic Command change of command ceremony at Offutt Air Force Base, Neb. Kehler relinquished command to U.S. Navy Adm. Cecil Haney, not shown, during the ceremony.