The Hyper Cobalt Rockets inside the Missile Silo. (Robotech Masters: "Final Nightmare")
A Missile Silo was a vertical cylindrical structure constructed often underground, for the storage and launching of Missiles. During the Second Robotech War, the Army of the Southern Cross used them to launch Hyper Cobalt Rockets against the Robotech Masters. (Robotech Masters: "Final Nightmare") Missile Silo's were also equipped to various REF Starships, such as the Shimakaze class.