Model number: YMS-18 Code name: Prototype Kämpfer Unit type: prototype heavy assault mobile suit Manufacturer: Principality of Zeon Operator: Principality of Zeon/Zeon remnants Rollout: UC 0079 First deployment: UC 0079 Accommodation: pilot only, in standard cockpit in torso Dimensions: unknown Weight: unknown Armor materials: unknown Powerplant: Minovsky type ultracompact fusion reactor, power output rating unknown Propulsion: rocket thrusters: total output unknown Performance: unknown Equipment and design features: sensors, range unknown Fixed armaments: 2 x autocannon, mounted in head Optional hand armaments: 2 x giant bazooka; machine gun; shotgun
The YMS-18 Prototype Kämpfer was a heavy assault mobile suit developed by the Principality of Zeon during the One Year War in UC 0079. Compared to the later production model MS-18E Kämpfer, the prototype version featured a different antenna design, different shoulder armor and additional rear skirt armor. Its armaments included head-mounted autocannons, a machine gun, a shotgun and two giant bazookas. In UC 0085, a custom colored blue unit was used by Zeon remnants working as space pirates.