200121-M-XH454-015 HOKKAIDO, Japan (Jan. 21, 2020) U.S. Navy corpsmen from 4th Marine Regiment, 3rd Marine Division, assess a simulated patient during a casualty evacuation training drill during exercise Northern Viper on Hokkudaien Training Area, Hokkaido, Japan, Jan. 21, 2020. Northern Viper is a regularly scheduled training exercise that is designed to enhance the interoperability of the U.S. and Japan Alliance by allowing infantry units to maintain their lethality and proficiency in infantry and combined arms tactics. (U.S. Marine Corps Photo By Cpl. Cameron E. Parks/Released)