Demonstration A U.S. Army soldier demonstrates how to properly clear a hallway for Iraqi police recruits during a hallway clearing scenario at Forward Operating Base Duke, Iraq, July 4, 2006. Iraqi police recruits go through a two-week training course called The Crucible, which is conducted by the U.S. Army's 3rd Battalion, 16th Field Artillery Regiment and civilian contractors. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 125622-U-UJD15-321.jpg Photo Gallery