COMBAT TRAINING TOUR U.S. Secretary of Defense Robert M. Gates shares a laugh with Lt. Col. Andy Kennedy during a tour of the Marine Corps Air Ground Combat Center in Twentynine Palms, Calif., May 29, 2007. The 1.4-square-mile training base prepares troops for future deployments. SHARE IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 493654-X-CVZ17-192.jpg Photo Gallery