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Commander, U.S. Navy Fourth Fleet Change of Command
190521-N-TR763-0188 MAYPORT, Fla. (May 21, 2019) Chief of Naval Operations (CNO) Adm. John Richardson delivers remarks during the change of command ceremony for Commander, U.S. Navy Fourth Fleet. Rear Adm. Don Gabrielson relieved Rear Admiral Sean S. Buck as Commander, U.S. Navy Fourth Fleet. (U.S. Navy Photo by Chief Mass Communication Specialist Nick Brown/Released)