180223-N-BK384-0094 SAN DIEGO (Feb. 23, 2018) Hospital ship USNS Mercy (T-AH 19) departs Naval Base San Diego to participate in Pacific Partnership 2018. PP-18’s mission is to work collectively with host and partner nations to enhance regional interoperability and disaster response capabilities, increase stability and security in the region and foster new and enduring friendships across the Indo-Asia-Pacific Region. (U.S. Navy photo by Mass Communication 3rd Class Justin A. Schoenberger/Released)