U.S. Marine Corps photo by Lance Cpl. Bridget M. Keane/Released 120911-M-JM783-107.JPG
Sep 19, 2012
Recruits learn to tread water in the deep end of the pool Sept. 11 aboard Marine Corps Recruit Depot San Diego. They are required to tread water for a total of four minutes while wearing a full uniform and combat boots. Treading water allows a swimmer to keep their head above water while staying in one area.
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