FIRE MISSION U.S. Marine mortarmen conduct fire missions during the 24th Marine Expeditioinary Unit's Realistic Urban Training on Camp Atterbury, Sept. 29, 2009. The unit will use these mortarmen to support the 1st Battalion, 9th Marine Regiment in hostile areas to neutralize threats. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 264298-U-UFV63-769.jpg Photo Gallery