RA1's Mobile Gap Generator tbh.
You can't even hack Rules.ini to make a proper unit out of it, it still does its dumb effects.
At least you can do it with the Radar Jammer
3 Ref Nod can be super expansive, and just because you don't spam as many infantry as a GDI player doesn't mean it devalues from the build.
Besides building a few Rocket Soldiers here and there doesn't hurt.