Navy Petty Officer 2nd Class Bernard Mariano, left, provides a rescue breather for mock casualty Navy Petty Officer 2nd Class Leigh Brevatte during a mass casualty drill aboard the Military Sealift Command hospital ship USNS Mercy in the Pacific Ocean, March 2, 2018. Mariano and Brevatte are hospital corpsmen participating in Pacific Partnership 2018. Pacific Partnership, now in its 13th iteration, is the largest annual multinational humanitarian assistance and disaster relief preparedness mission conducted in the Indo-Pacific. Navy photo by Petty Officer 3rd Class Cameron Pinske