181106-N-ME396-041 GROTON, Conn. (Nov. 6, 2018) Naval Submarine School students simulate working conditions on a submarine using the Multipurpose Reconfigurable Training System 3D (MRTS 3D). MRTS 3D is an advanced virtual reality simulation of the diesel auxiliary system aboard a modern American submarine designed to give Sailors a hands-on training experience handling equipment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Tristan B. Lotz/Released)