A lot of the tutorials make reference to, for example, the UEF T3 Heavy Point Defense and the UEF T3 Mobile Missile Platform. However, I do not have them in my version of the game. Was this patched in later, or is it in Forged Alliance/Supreme Commander 2?
There was a "stand alone expansion," Forged Alliance, introducing new faction specific units & structures, as well as a fourth playable faction.
The UEF T3 point defense was introduced in that expansion.