U.S. Marine Corps Cpl. Ramon Trevino, an infantry Marine

U.S. Marine Corps Cpl. Ramon Trevino, an infantry Marine with 1st Battalion, 5th Marine Regiment, participates in a decontamination drill during Steel Knight 2019 (SK19) 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 by Cpl. Rhita Daniel)