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The M163 Vulcan Air Defense System (VADS) is a self-propelled anti-aircraft gun (SPAAG) that was used by the United States Army. The M168 gun is a variant of the General Dynamics 20 mm M61 Vulcan rotary cannon—the standard cannon in most US combat aircraft since the 1960s. The weapon is either mounted on a modified M113 vehicle (the M741 carrier) or on a towed trailer, which is designated the M167. The systems were designed to complement the M48 Chaparral missile system. The M163s uses a small, range-only radar, the AN/VPS-2, and an M61 optical lead-calculating sight. The gun fires at 3,000 rounds per minute in short bursts of 10, 30, 60, or 100 rounds, or it can fire in continuous fire mode at a rate of 1,000 rounds per minute. In the M163 a linkless feed system is used, in the M167 (towed) linked ammunition is used. The system is suitable for night operations with the use of AN/PVS series night vision sights that mount above the sight reticle. VADS was slated to be replaced by the M247 Sergeant York DIVA
