100120-N-7090S-140 GROTON, Conn. (Jan. 20, 2010) Chief Machinist's Mate Christopher Frank observes Sailors using the submarine trainer to learn basic submarine operations during the Basic Enlisted Submarine School at Naval Submarine Base New London, Conn. ( Navy photo by Mass Communication Specialist 2nd Class Jhi L. Scott/Released) US Navy 100120-N-7090S-140 Chief Machinist's Mate Christopher Frank observes Sailors using the submarine trainer to learn basic submarine operations during the Basic Enlisted Submarine School at Naval Submarine Base New London

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Photo credit: © PJF Military Collection / Alamy / Afripics
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