GREAT LAKES, Ill. (June 20, 2017) A student testing to be qualified as a 2nd Class Swimmer utilizes the crawl stroke at the Naval Station Great Lakes Moral, Welfare and Recreation swim pool Recruit Training Command (RTC). The testing is part of the curriculum for Boatswain's Mate and Seaman Professional Apprenticeship Career Track accession sailors. (U.S. Navy photo by Brian Walsh/Released)