180521-N-FV739-236 NHA TRANG, Vietnam (May 21, 2018) Medical professionals assigned to the U.S. Navy hospital ship USNS Mercy (T-AH-19) perform knee surgery with local Vietnamese surgeons in support of Pacific Partnership (PP) 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-Pacific region. (U.S. Navy photo by Mass Communication Specialist 3rd Class Christopher A. Veloicaza/Released)