170629-N-IK959-119 GREAT LAKES, Ill. (June 29, 2017) Chief of Naval Operations (CNO) Adm. John Richardson observes line handling training aboard the USS Marlinspike Seamanship Trainer at Recruit Training Command in Great Lakes, Ill. CNO and Master Chief Petty Officer of the Navy Steven Giordano toured RTC facilities, including the Navy’s largest simulator USS Trayer (BST 21), a 210-foot-long replica of an Arleigh Burke-class guided missile destroyer. (U.S. Navy photo by Scott A. Thornbloom/Released)