OATH OF OFFICE Defense Secretary Robert M. Gates delivers the oath of office to Navy Adm. James Winnefeld during his promotion ceremony on Peterson Air Force Base, Colo., May 19, 2010. Winnefeld assumed command of North American Aerospace Defense Command and U.S. Northern Command from Air Force Gen. Gene Renuart during a change of command ceremony. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 071322-T-CUH17-739.jpg Photo Gallery