Kilrathi stealth fighters are invisible to human or instrument detection. Formerly dismissed as rumors, their existence was proven in 2667 following a confirmed visual sighting. The intricacies of the stealth system remained solely in the possession of Kilrathi scientists until 2669, when Confed R & D successfully developed a prototype cloaking device. The only fighter currently equipped with the cloak mechanism is the new Excalibur that is currently in testing.