U.S. Marines assigned to the 2nd Marine Aircraft Wing participate in Water Survival-Advanced training at Marine Corps Air Station Cherry Point, N.C., July 29, 2017.
WSA is a course that tests Marines on rescues, strokes and distance swimming. (U.S. Marine Corps photo by Lance Cpl. Jailine Martinez)
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www.facebook.com/DoD.Imagery. Original public domain image from Flickr