A rock-crawler tries to make his way up Back Door in Johnson Valley, Calif., Feb. 5, 2018. The challenging climb filled with rocks and deep craters is one of many that King of the Hammers attendees take on during KOH, the largest racing and rock-crawling event in North America. (Marine Corps photo by Kelly O’Sullivan)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 4400, california, hammers, johnson, king, koh, offroading, usmc, valley