OFFICIAL PARTY U.S. Defense Secretary Robert M. Gates, far left, U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, second left, Canadian Gen. Walter Natynczyk, chief of the defense staff, U.S. Air Force Gen. Gene Renuart, outgoing commander of U.S. Northern Command/North American Aerospace Defense Command, and U.S. Navy Adm. James A. Winnefeld, incoming commander, stand at the presentation of the colors during the Northcom/NORAD Change of Command ceremony on Peterson Air Force Base, Colo., May SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 987540-Q-ETQ48-584.jpg Photo Gallery