The F/S-400 Shaska was a human A/X interceptor. Initially developed in 2496 in the aftermath of Operation: CHARLEMAGNE to act as planetary defense fighters and shipborne interceptors to fight back against Insurrectionist warships, the Shaska began production in 2502 after extensive trials, and was assigned mainly to ship complements and planetary defense units in the Outer Colonies. The craft proved to be a very effective asset against rebel ships without AI control of their point-defense guns, leading to the craft's eventual adoption by UNSC Air Force detachments in the Inner Colonies.