190822-N-BB269-0139 WASHINGTON (Aug. 22, 2019) Chief of Naval Operations (CNO) Adm. John Richardson is relieved by Adm. Mike Gilday at a change of office ceremony held at the Washington Navy Yard. Richardson served as the 31st Chief of Naval Operations from September 2015 to August 2019. (U.S. Navy photo by Mass Communication Specialist 1st Class Raymond D. Diaz III/Released)