Notes: The Vulcan, and its upgraded version, the PIVAD, is one of the most common air defense guns in the world, whether in trailer-mounted versions, fixed mountings, naval mountings, and vehicular use. A modified form is a very common aircraft gun. The Vulcan is a six-barreled rotary cannon that fires at an extremely rapid rate of fire, projecting a virtual wall of metal at targets. The standard model has a range-only radar and a generator; the PIVAD adds a new digital optical sight, and a ballistic computer. A third model, the Basic Vulcan, is designed for export to poorer countries; it deletes the radar, digital sight, and power controls for elevation and traverse.

Notes: Also known as the Bushmaster, this autocannon is fitted to the M-2 and M-3 Bradley Fighting Vehicles and the LAV-25, as well as US Navy deck mountings. It is also employed on MOWAG Piranhas used by the Saudis. Rounds may be fired on semiautomatic, ROF 2, ROF3, or ROF5. This weapon fires both US-made and European ammunition. The mechanism is actuated by a chain drive, hence the name.

Notes: This weapon was designed to partially replace the Mark 19, ASP, and M-2HB. The OCSWs rounds, like the OICWs grenade launcher rounds, can be set to airburst over a target’s heads or strike the target directly. The OCSW fires a special 25mm round with a computerized proximity fuse, either HE or HEDP. The OSCW is fired from a lightweight tripod developed especially for this weapon, or it may be fired from a NHT mount. The OCSW uses a computerized laser sight, a slightly improved version of the IR imaging sight on the OICW. The OCSW is fed from special cassettes of 22 or 74 rounds.

Twilight 2000 Notes: The Objective Crew-Served Weapon (OCSW) was rushed into service several years ahead of its target date, however, few were available by the Twilight War.

Merc 2000 Notes: Budget cuts largely ended deployment of this weapon.

Notes: The ASP-30 (Automatic, Self-Powered) is a gas-operated version of the 30mm ChainGun designed as an infantry support weapon. It fits on an NHT or any other mount that is equivalent to an NHT. It is fed from a 50-round belt. Recoil is manageable when on a tripod or vehicle mount.

This weapon is an upgraded M-242 Chain Gun, and retains 70% commonality of parts with that weapon. The Bushmaster II can use the same ammunition as the GAU-8, and can also fire 30mm Rarden and KCB ammunition. It is used on US Navy deck mounts, and on the Swedish CV-30, and on some versions of the AAAV.