Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, presents a Defense Department Medal for Distinguished Public Service to Sherry Gortney, wife of Navy Adm. Bill Gortney, during the change-of-command ceremony for the North American Aerospace Defense Command and U.S. Northern Command at Peterson Air Force Base, Colo., May 13, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro