An Army combat engineer throws a smoke grenade to provide cover for his engineers as they advance forward to establish a firing position during a training exercise on Fort Bragg, N.C., July 21, 2011. An Army combat engineer throws a smoke grenade to provide cover for his engineers as they advance forward to establish a firing position during a training exercise on Fort Bragg, N.C., July 21, 2011. SHARE: Download: Full Size (2.51 MB) Tags: Photo Essays Credit: VIRIN: 016130-U-NRJ33-091.jpg Photo Gallery