US Navy 070712-N-8547M-015 Gunnery Sgt. Ronald E. Russell, Marine Corps advisor to Naval Mobile Construction Battalion (NMCB) 5, briefs Sailors before a land navigation evolution during a field exercise (FEX)

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Author: U.S. Navy photo by Mass Communication Specialist 3rd Class Patrick W. Mullen IIISource: commons.wikimedia.org

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