210108-N-WI365-1229 Gunner’s Mate Seaman Carlos Ruiz, from Chicago, checks the sights on M16 rifles during a Navy Handgun Qualifications Course (NHQC) on the flight deck aboard the Arleigh Burke-class guided-missile destroyer USS John S. McCain (DDG 56). McCain is assigned to Destroyer Squadron Fifteen (DESRON 15), the Navy’s largest forward-deployed DESRON and the U.S. 7th Fleet’s principal surface force. (U.S. Navy photo by Mass Communication Specialist 2nd Class Markus Castaneda)