The UNSC Midsummer Night (FSG-250) was a Heimdall-class Frigate (Midsummer Night-subclass) in service with the UNSC Navy, and operated by the Prowler Corps. The Midsummer Night was designed with stealth in mind when the ship was laid down. It's primary role was to serve as a command vessel for Prowler "Wolf Packs", though the Night was given the task of a base for NAVSPECWAR operations when it was still under construction.