190818-N-OQ778-1117 RIO DE JANEIRO (Aug. 18, 2019) U.S. Marine Corps Reservist Cpl. Evan Long, assigned to the 4th Assault Amphibian Battalion, operates an amphibious assault vehicle in support of UNITAS LX in Rio de Janeiro Aug. 18, 2019. UNITAS, which is Latin for unity, was conceived in 1959, first executed in 1960 and has been held every year since. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kody A. Phillips/Released)