Because vanilla Generals isn't good enough for you. Realism overhauls and graphical enhancements are the main points of existence of this mod. If you want tons of new units, this is not the mod for you.
From on now, USA faction shall be changed to NATO.
A replacement of the old Bradley used in the previous versions. All of the features are the same as in the latest one.
Read for more info here: Moddb.com