Marines with 1st Tank Battalion, 1st Marine Division, participate in exercise Steel Knight (SK20) at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 9, 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 against a peer or near-peer threat. ( Marine Corps photo by Cpl. Alexa M. Hernandez)

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