Also known as: 120cm対地対空両用磁気火薬複合加速方式半自動固定砲, ストーンヘンジ
Gigantic railguns in the Ace Combat universe, debuting in Ace Combat 04 and later appearing in Ace Combat 7. Originally built for shooting down asteroids by Usea, the Erusean military seized the guns and used them for anti-aircraft work until an air raid would finally see the facility neutralized. Very similar facilities with the same name appeared in Ace Combat Infinity. The original facility would return in Ace Combat 7, with the sole remaining gun being used to shoot down an Arsenal Bird.
The official name is: 120cm-Caliber-Anti-Surface-And-Air Gunpowder-And-Electromagnetic-Propelling Semiautomatic-Fixated Guns, or the Spaceguard Turret Network