U.S. Marine Corps LCpl. Anthony Doten, an infantry

U.S. Marine Corps LCpl. Anthony Doten, an infantry marine with 1st Battalion, 5th Marines dresses in mission oriented protective gear posture (MOPP) gear in preparation for a decontamination drill during Steel Knight 2019 on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 06, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo illustration by Cpl. Rhita Daniel)