The M167 Vulcan Air Defense System (VADS) is a 20mm, light anti-aircraft gun; essentially a ground-based version of the M61 Vulcan, some versions of the VADS were towed, while others were fitted to modified M113 APCs. The M167 has been retired from US service.
VADS AA guns are encountered in several titles; in most games it poses little danger to the player, although the ones that appear in Ace Combat Zero and 6 seem somewhat more accurate than in other games.
- Ace Combat 04: Shattered Skies
- Ace Combat 5: The Unsung War
- Ace Combat Zero: The Belkan War
- Ace Combat X: Skies of Deception
- Ace Combat 6: Fires of Liberation
- Ace Combat: Joint Assault
- Belkan Army
- Republic of Emmeria Army
- Estovakian Army
- Erusean Army
- Leasath Ground Forces
- Yuktobanian Army
- Ace Combat Series - Ingame Data
Although it saw limited use in the real world, the M167 is one of the most common AA Guns encountered in the Ace Combat series.