U.S. Army Spc. Christian Downs, a generator mechanic, 48th Combat Support Hospital, Fort Meade, Md., conducts preventive maintenance checks on an electric generator at Fort Hunter Liggett, Calif., May 19, 2011, in support of Global Medic 2011 and Warrior 91 11-01. Global Medic/ Warrior is a joint reserve field training exercise for theater aeromedical evacuation system and ground medical components designed to replicate all aspects of combat medical service support.