PACIFIC OCEAN (Sept. 11, 2020) Cmdr. Chris Gahl, commanding officer of the Arleigh Burke-class guided-missile destroyer USS Barry (DDG 52), talks to a submarine on the underwater telephone during the Pacific Vanguard 2020 exercise. Pacific Vanguard serves as an opportunity to exercise and improve multinational interoperability at all levels; to improve tactical proficiency; and to adapt to ever changing regional challenges. Barry is underway conducting operations in support of security and stability in the Indo-Pacific while assigned to Destroyer Squadron (DESRON) 15, the Navy’s largest forward-deployed DESRON and the U.S. 7th Fleet’s principal surface force. (U.S. Navy photo by Lt. j.g. Samuel Hardgrove)