180302-N-LW591-032 GROTON, Conn. (March 2, 2018) Lt. jg. William Gregory uses a commercially available game controller to maneuver the photonic mast aboard the Virginia-class fast-attack submarine Pre-commissioning Unit (PCU) Colorado (SSN 788) during a tour of the Colorado. 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 Steven Hoskins/Released)