Cpl. Mckevin Lusung, a chemical biological radiological nuclear defense specialist with the 22nd Marine Expeditionary Unit, utilizes the sidestroke to complete an endurance swim during a Water Survival-Advanced (WSA) course aboard Marine Corps Base Camp Lejeune, North Carolina, August 10, 2021. WSA teaches Marines how to conduct water rescues, utilize different swim strokes and gain confidence in the water.

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