181030-N-UK333-165 KETCHIKAN, Alaska (Oct. 30, 2018) Sailors assigned to Undersea Rescue Command (URC) conduct maintenance on the pressurized rescue module emergency breathing system in Ketchikan, Alaska, Oct. 30, 2018. URC is conducting a submarine rescue exercise with the Virginia-class fast-attack submarine USS Texas (SSN 775) off the coast of Ketchikan, Alaska, at the Southeast Alaska Acoustic Measurement Facility static site. (U.S. Navy photo by Mass Communication Specialist 1st Class Ronald Gutridge/Released)