180624-N-HI707-0006 ATLANTIC OCEAN (June 24, 2018) Sailors assigned to the Virginia-class fast attack submarine Pre-Commissioning Unit (PCU) Indiana (SSN 789) look over reference manuals while conducting operational checks in the diesel engineering spaces. Indiana is the 16th Virginia-class fast attack submarine and is scheduled to be commissioned Sept. 29, 2018. (U.S. Navy photo by Chief Mass Communication Specialst Darryl Wood/Released)