M167 Vulcan

The M167 Vulcan Air Defense System is a towed, short-range air defense gun system designed to protect ground forces and installations. It utilizes the M61 Vulcan 20mm rotary cannon, capable of firing at high rates to engage low-flying aircraft and helicopters.

Developed in the mid-1960s to replace obsolete World War II-era gun systems, the M167 entered service with the United States military in 1967. It saw its first major combat deployment during the Vietnam War, where it was highly valued for base defense and direct-fire ground support, and was later utilized during the Gulf War. Although the U.S. military retired the system in 1994 in favor of the missile-armed Avenger, the M167 remains in active service with several international allies, including South Korea and Egypt.