U.S. Army M997 High Mobility Multi-Purpose Wheeled Vehicle Ambulances sit in front of the Mobile Aeromedical Staging Facility before delivering simulated patients during the joint service field exercise JRTC 12-06 at the Joint Readiness Training Center, Fort Polk, La., May 7, 2012. JRTC is designed to prepare and educate U.S. military service members for deployments to the Middle East.