The Type-23 Stealth Drone was a independently thinking attack bot that could be used for assassination missions. Using the same formula used to create smart AIs, Type-23s were engineered to be able to think for themselves and accomplish missions alone while still being fully loyal to the UNSC. The Type-23, nicknamed the Ripper, was not as intelligent as “smart” AIs, or even “dumb” AIs, but were still deadly efficient.