U.S. Army soldiers set up an 81 mm mortar system during a live-fire demonstration. U.S. Army soldiers from the 3rd Battalion, 21st Infantry Regiment set up an 81 mm mortar system during a live-fire demonstration for the Iraqi Army's Light Battalion, 20th Brigade, 5th Division at Forward Operating Base Normandy in Diyala, Iraq, on June 28, 2009. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 311141-G-LPN56-994.jpg Photo Gallery