181023-N-PO203-0072 CHARLESTON, S.C. (Oct. 23, 2018) Rear Adm. David Hahn, chief of naval research, gives the keynote address during the 2018 OCEANS conference and exposition. The semi-annual event brings together global marine technologists, engineers, scientists, students, government officials, lawyers, and advocates to focus on breakthrough innovations and technology advances for protecting and sustaining our oceans and coasts. (U.S. Navy photo by John F. Williams/Released)