171214-N-ES994-023 SEOUL, Republic of Korea (Dec. 14, 2017) Chief of Naval Operations (CNO) Adm. John Richardson, left, walks with Adm. Um, Hyun-Seong, Chief of Naval Operations of the Republic of Korea (ROK) Navy, to reaffirm their commitment to the US-ROK alliance and discuss opportunities to increase interoperability. (U.S. Navy photo by Chief Mass Communication Specialist Elliott Fabrizio/Released)