Brazilian sailors and Marines treat a simulated casualty during a disaster relief exercise as part of UNITAS LX at Ilha da Marambia, Brazil, Aug. 27, 2019. The Brazilian medical team is training to perform surgeries in field environments. UNITAS is the world's longest-running, annual exercise and brings together multinational forces from 11 countries to include Brazil, Colombia, Peru, Chile, Argentina, Ecuador, Panama, Paraguay, Mexico, Great Britain and the United States. The exercise focuses in strengthening the existing regional partnerships and encourages establishing new relationships through the exchange of maritime mission-focused knowledge and expertise during multinational training operations. (U.S. Marine Corps photo by Cpl. Amy Phan)