The USS Chicago (SSN-721) is a nuclear-powered fast attack submarine of the Los Angeles class. Commissioned in 1986, it is designed for a variety of missions, including anti-submarine warfare, anti-surface ship warfare, and intelligence gathering. The submarine can operate at great depths and is equipped with advanced sonar and weapon systems. The USS Chicago has a length of 362 feet and can carry a crew of about 130 personnel. It is capable of launching torpedoes and cruise missiles, making it a versatile asset for the United States Navy. The submarine has undergone several upgrades to enhance its capabilities throughout its service.