Cpl. Jessi C. Clark checks the airways of a mannequin

Cpl. Jessi C. Clark checks the airways of a mannequin during his individual assessment at a Combat Lifesaver course on Camp Hansen, Okinawa, Japan, Nov. 22, 2016. During the three-day class, Marines learned how to give intravenous injections, apply tourniquets and regulate the respiratory system. Clark, from Burnsville, North Carolina, is an optics technician with 3rd Battalion, 3rd Marine Regiment, a forward-deployed unit from Kaneohe Bay, Hawaii. The battalion is supporting 3rd Marine Division, III Marine Expeditionary Force, based in Okinawa, Japan. (U.S. Marine Corps photo by Cpl. Jessica Etheridge / Released)