Marines with 2nd Battalion, 4th Marine Regiment, 1st Marine Division (1st MarDiv), check a radio antenna during a long distance, high frequency (HF) training event on Camp Pendleton, California, Jan. 16, 2020. This training between 1st MarDiv and 3rd Marine Division allowed both units to train in HF communications over the Pacific ocean. The training helps the units maintain a low electromagnetic signature which allows for distributed operations without detection in the operating environment. ( Marine Corps photo by Lance Cpl. Benjamin Aulick)

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