NUKU’ALOFA, Tonga (June 26, 2025) U.S. Public Health Service Lt. Sung Jik Park, left, Environmental Health Officer with Pacific Partnership 2025 (PP-25), trains a local public health official in the quality testing of public water sources with a Palintest kit during PP-25 in Nuku’Alofa, Tonga, June 26, 2025. Now in its 21st iteration, the Pacific Partnership series is the largest annual multinational humanitarian assistance and disaster management preparedness mission conducted in the Indo-Pacific. Pacific Partnership works collaboratively with host and partner nations to enhance regional interoperability and disaster response capabilities, increase security and stability in the region, and foster new and enduring friendships in the Indo-Pacific. (U.S. Navy photo by Mass Communication Specialist 2nd Class Moises Sandoval/Released)