William Beaumont Army Medical Center is the second busiest trauma center in the Army. Recent facility renovations there necessitated the use of a temporary field hospital to serve as the Emergency Department, which included the initial evaluation and resuscitation of trauma patients by the trauma team. Although designed for the battlefield, the use of field medical equipment during renovation of military medical facilities is not a new concept. The MUST (Medical Unit Self-contained Transportable) and DEPMEDS (Deployable Medical Systems) have been used successfully during fixed-facility renovations. Previously described functions included inpatient services, outpatient care, and operating room facilities. However, no published information directly compares the use of these temporary structures with standard fixed facilities in the initial management of trauma patients. Trauma patients often present with complex concerns, are highly resource intensive, and their survival is dependent on efficient, timely care. We compared several aspects of patient outcome in the DEPMEDS versus the medical center.