Marines with 7th Engineer Support Battalion prepare to conduct the treading in water portion of their water survival training at Camp Pendleton, Calif., Dec. 18, 2017. Marines are required to have their heads above water for the entirety of four minutes for this portion of their qualification. ( Marine Corps photo by Lance Cpl. Timmothy Shoemaker, caption by Cpl. Joseph Sorci)

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Keywords: 7th, base, battalion, camp, corps, engineer, marine, marines, pendleton, qual, support, survival, swim, training, water