ON-THE-GO OPERATIONS Defense Secretary Leon E. Panetta is accompanied by Navy Adm. James Winnefeld Jr., commander of North American Aerospace Defense and U.S. Northern Command, during a visit to discuss homeland defense operations on Peterson Air Force Base, Colo., July 29, 2011. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 773821-A-MNN55-758.jpg Photo Gallery