Petty Officer 1st Class Mauricio Armas, 38, from Puebla City, Mexico, an X-ray technician with Camp Taqaddum Surgical, 1st Maintenance Battalion (-) (Reinforced), 1st Marine Logistics Group, positions his X-ray machine during a mass casualty exercise, Nov. 20. The drill required the staff to treat multiple patients with a variety of simulated wounds, testing their ability to react in a timely manner to situations they might encounter in a combat environment.