180516-N-MD713-0011 PACIFIC OCEAN (May 16, 2018) Hospital Corpsman 1st Class Karla Quintero, right, and Lt. John Wesner use a chemical identification system to perform tests on water samples aboard the U.S. Navy hospital ship USNS Mercy (T-AH 19). Mercy is deployed in support of Pacific Partnership 2018, whose 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 Cameron Pinske/Released)