U.S. Army Specialist Edgar Acena, from the 60th Ordnance Company, and U.S. Air Force Senior Airmen Shaun Heil and Kyle Parson, from the 407th Expeditionary Civil Engineer Squadron, check a doorway for heat before making an entry into a training trailer as part of a Fire Officer I practical at Ali Base, Iraq Jan. 23, 2010. The objective of the Fire Officer I practical was to respond and take Incident Command of an emergency. (US Air Force photo by Staff Sgt Miguel Lara III/Released.)