U.S. Marines with Special Purpose Marine Air-Ground Task Force - UNITAS get briefed on the events of an amphibious landing during UNITAS LXII in Salinas, Peru, Oct. 2, 2021. UNITAS is the world's longest-running maritime exercise. Hosted this year by Peru, it brings together multinational forces from twenty countries and includes 29 ships, four submarines, and twenty aircraft conducting operations off the coast of Lima and in the jungles of Iquitos. The exercise trains forces to conduct joint maritime operations and focuses on strengthening partnerships and increasing interoperability and capability between participating naval and marine forces.