Hull Maintenance Technician 2nd Class Ruben Casas shows Junior ROTC students from Marianas High School the various navigation instruments on the bridge during a tour of the submarine tender USS Frank Cable (AS 40). Frank Cable conducts maintenance and support of submarine and surface vessels deployed in the U.S. 7th Fleet area of responsibility. (U.S. Navy photo by Mass Communication Specialist 1st Class Jason C. Swink/Released)