Petty Officer 3rd Class Benjamin J. Martin simulates applying a nasopharyngeal airway to Petty Officer 3rd Class John A. Eller during tactical combat casualty care training May 16 at Camp Foster. Corpsman must complete the course annually in order to maintain proficiency and remain prepared to respond appropriately to a vast array of contingencies across the region. Martin and Eller are hospital corpsmen with 3rd Medical Battalion, which is part of 3rd Marine Logistics Group, III Marine Expeditionary Force.