180110-N-JE719-128 ATLANTIC OCEAN (Jan. 10, 2018) Machinist Mate (Auxiliary) 3rd Class Allen L. Meredith, front, and Machinist Mate (Auxiliary) 3rd Class Nicholas Abbott, back, conduct temperature adn pressure checks on the overall operational status of the Mark III-B Carbon Dioxide (CO2) Removal Plant aboard the Pre-Commissioning Unit (PCU) Colorado (SSN 788). Colorado is the 15th Virginia-class attack submarine and is scheduled to be commissioned March 17, 2018. (U.S. Navy photo by Mass Communication Specialist 1st Class Jeffrey M. Richardson/Released)