Marines with the 2nd Battalion, 23rd Marine Regiment dig into their defense during the Mobile Assault Course at Training Area Prospect as a part of Unit Deployment Program aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Aug. 9, 2018. The purpose of UDP is to sharpen technical and tactical skills and enhance unit cohesion to ensure mission success. ( Marine Corps photo by Lance Cpl. William Chockey)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: center, combat, corps, infantry, marine, usmc