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U.S. Marine Corps Cpl. William Testorff with Headquarters Battalion, 3rd Marine Division, performs a radio check while on patrol during Samurai 20-1 on Camp Hansen, Okinawa, Japan, Oct. 22, 2019. The purpose of this exercise is to conduct battle drills that validate the 3rd Marine Division's movement, setup of a combat operations center, force protection, and passage of command and control between supporting elements.