U.S. Army SGT. 1ST Class Christopher W. Thorn, Bravo Troop, 3rd Squadron, 1ST Cavalry Regiment, 3rd Heavy Brigade Combat Team (HBCT), 3rd Infantry Division, uses a tactical radio system to request additional support during a combat patrol training scenario at the National Training Center (NTC), Fort Irwin, Calif., Jan. 20, 2007. More than four thousand Soldiers from the 3rd HBCT are participating in the month-long training rotation at the NTC to prepare them for future deployments. (U.S. Air Force photo by STAFF SGT. Shawn Weismiller) (Released)