180805-N-PL946-1025 GREAT LAKES, Ill. (Aug. 6, 2018) Boatswain's Mate 2nd Class Darren Marks briefs Sen. Tammy Duckworth, of Illinois, on line-handling procedures at the USS Marlinspike training facility during her tour of Recruit Training Command (RTC). Naval Station Great Lakes and RTC hosted Duckworth for a command overview and facilities tour. More than 30,000 recruits graduate annually from the Navy's only boot camp. (U.S. Navy photo by Mass Communication Specialist 2nd Class Spencer Fling)