Sgt. Nathan McWalters provides security at an oil refinery. U.S. Army Sgt. Nathan McWalters provides security at an oil refinery in Qayyarah, Iraq, on Sept. 29, 2006. McWalters is assigned to the 3rd Stryker Brigade Combat Team, 2nd Infantry Division. SHARE IMAGE: Download Image: Full Size (0.12 MB) Photo By: VIRIN: 941564-D-AIW17-358.jpg Photo Gallery