An Army combat engineer throws a smoke grenade to provide cover for his engineers as they advance. 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 at Fort Bragg, N.C., on July 21, 2011. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 232782-P-DGU34-388.jpg Photo Gallery