"Anti-Air Artillery. Dual 20mm rotary cannons" - Game
Two gattling guns mounted on a turret, similar to the C-RAM or CIWS on ships.
Real Life Edit
It's name, faction, and role seems to be based off the Russian ZU-23-2 with its twin barreled auto cannon. The game replaces each auto cannon with an M61 Vulcan and automates fire control.