The YSS-1000,usually simply referred to as the Sabre, is a space superiority starfighter used by the UNSC Defense Force during the Human-Covenant War. Its first known use was in Operation: UPPERCUT during the Fall of Reach. The YSS-1000 is a space-based fighter, which can be launched vertically from a ground-based launch platforms using a system of detachable multi-stage rockets to propel itself out of a planet's gravitational pull and atmosphere.The Sabre's speed is similar to the Seraph's and also has an afterburner ability which increases speed for a short duration of time. The Sabre is also capable of performing complex barrel rolls , Split S maneuvers, and Immelmann turns. The fighter's armament includes twin autocannons as well as linked "Medusa" missile pods with locking abilities. The Sabre also possesses energy shielding technology. Its targeting computer can identify enemy contacts from a long distance, as well as show the distance to a target.