The Fox Cannon was a Self-Propelled Artillery vehicle, in service with the United Nations Space Command. It was capable of firing five shells per minute, and with great accuracy due to Satellite targeting over a distance greater than 50 kilometres. The Fox was equipped with a 175mm cannon, that shot the M179 Projectile. Given its role, however, it was likely replaced by the Cobra.
While developing the Halo games, Bungie, 343 Industries and Ensemble Studios have had to cut some content, such as vehicles, gameplay, and story elements, from the final products. Much of this content has been confirmed by videos and commentary in special edition DVDs, interviews with developers, and released concept art.