Brazilian marine Capt. de Fragata Marcos Ferreira takes

Brazilian marine Capt. de Fragata Marcos Ferreira takes notes during a downed aircraft battle drill during PANAMAX 2017 on Marine Corps Base Camp Pendleton, California, Aug. 15, 2017. Foreign military leaders from Peru, Colombia and Brazil worked with U.S. Marines with the 13th Marine Expeditionary Unit to simulate shipboard operations as part of the exercise. PANAMAX is an annual multinational training exercise focused on the security of the Panama Canal, with participants from 17 countries and involving more than 3,500 personnel throughout U.S. Southern Command. (U.S. Marine Corps photo by Lance Cpl. Danny Gonzalez)