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In this Thursday, March 15, 2018 photo, preparations are under way for the commissioning of the U.S. Navy Virginia-class attack submarine PCU (pre-commissioning unit) Colorado (SSN 788) at the naval submarine base in Groton, Conn. The submarine will be the USS Colorado and begins service Saturday, March 17, 2018, at the Naval Submarine Base in Groton. (Sean D. Elliot/The Day via AP)

In this Thursday, March 15, 2018 photo, preparations are under way for the commissioning of the U.S. Navy Virginia-class attack submarine PCU (pre-commissioning unit) Colorado (SSN 788) at the naval submarine base in Groton, Conn. The submarine will be the USS Colorado and begins service Saturday, March 17, 2018, at the Naval Submarine Base in Groton. (Sean D. Elliot/The Day via AP)

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