A Marine takes a break atop his tank at the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif. A Marine takes a break atop his tank during a Combined Arms Exercise at the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., on Feb. 1, 2000. Marines from the 2nd Marine Division's 2nd Tank Battalion took part in the exercise which is designed to involve all elements of the Marine Air Ground Task Force in a live fire, desert training environment. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 107228-O-COS98-899.jpg Photo Gallery