Naval ships from Brazil, Peru, Argentina and the United States conduct naval formations during a training exercise for UNITAS LX in Brazil Aug. 24, 2019. The exercise was done to test interoperability and communication between the partner nations. 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 Sgt. Daniel Barriospirela)