U.S. Marines with 23rd Marine Regiment, 4th Marine Division, in support of Special Purpose Marine Air-Ground Task Force UNITAS LXIV, and partner nation militaries, receive instruction from the Colombian Naval Infantry, in a water survival course during exercise UNITAS LXIV, aboard Escuela de Formación de Infantería Marina Coveñas in Coveñas, Colombia, July 12, 2023. UNITAS is the world’s longest-running maritime exercise. Hosted this year by Colombia, it brings together multinational forces from 20 partner nations, including 26 warships/vessels, three submarines, 25 aircraft (fixed wing/helicopter) and approximately 7,000 people. The exercise trains forces in joint maritime operations that enhance tactical proficiency and increase interoperability with the presence of unmanned air, surface, and submarine systems. (U.S. Marine Corps photo by Sgt. Emily Kirk)