Petty Officer 3rd Class Xin Wu, a surgical technician with Camp Taqaddum Surgical, 1st Maintenance Battalion (-) (Reinforced), 1st Marine Logistics Group, 26, from San Francisco, prepares medical instruments in the operating room during a mass casualty drill, Oct. 31, 2008. The drill required the staff to treat multiple patients with a variety of wounds. These scenarios tested the staff's ability to react in a timely manner to situations they might encounter in a combat environment.