181102-N-JE719-1431 NORFOLK (Nov. 2, 2018) Vice Adm. Chas Richard, center, commander of Submarine Forces, explains the mechanics of a submarine-towed array to Secretary of Energy Rick Perry during a tour of the Virginia-class attack submarine USS John Warner (SSN 785) at Naval Station Norfolk. Perry visited John Warner for a submarine familiarization tour and to meet Sailors. (U.S. Navy photo by Mass Communication Specialist 1st Class Jeffrey M. Richardson/Released)