191210-M-AB981-1001 TWENTYNINE PALMS, Calif. (Dec. 10, 2019) A U.S. Navy Corpsman with 1st Marine Division conducts a whole-blood transfusion practical application during Steel Knight 20 (SK20) at Marine Air Ground Combat Center, Twentynine Palms, California, Dec. 10, 2019. SK20 is an annual training exercise executed by approximately 13,000 Marines and Sailors designed to improve and assess the 1st Marine Division’s ability to fight and win a complex, dispersed fight against a peer or near-peer threat. (U.S. Marine Corps photo by Sgt. Zachary Catron/Released)