USS Chicago (SSN-721)
 USS Chicago (SSN-721) is a Los Angeles-class submarine the fourth ship of the United States Navy to be named for the city of Chicago Illinois. The contract to build her was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News Virginia on 13 August 1981 and her keel was laid down on 5 January 1983. She was launched on 13 October 1984 sponsored by Mrs. Vicki Ann Paisley wife of Melvyn R.