The Sabre was the result of the Sabre Program, a top-secret UNSC project, denied as a "preposterous rumor" by three UNSC administrations, in which Noble Six was a pilot at some point during the Insurrection of Mamore. By 2552, the YSS-1000 served as the UNSCDF's primary planetary defense fighter. Reach had multiple Sabre fighters stored in launch facilities on the planet's surface. In addition, the orbital platform Anchor 9 had several Sabres stored in its launch bays. Gamma Station also had several Sabres stored.