CONCERTINA VIEW U.S. Marines patrol with role players during an exercise at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Feb. 3, 2009. The Marines, assigned to 3rd Battalion, 3rd Marine Regiment, are training for their deployment to Afghanistan. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 030753-I-SCV40-154.jpg Photo Gallery