Celestial Empire's ground forces. It's not the mass spam of clones people are scared of, it's the Mammoth tank. Superior level Railguns, destroy lightly armored, unshielded targets. Deal heavy/critical to medium armored, unshielded targets, and fight heavily armored tanks, with usual victory. But they only send one, more for the intimidation factor. It's a massive and low tank.
Railguns are very heavy, which cause the turret to be slow. Missiles used for fast targets and flying targets. When used on fast targets, they target critical points like an engine or mobility point, so then the gun can hit them