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.
Planned features are as followed:
# This doesn't mean it will include every options #
-Normal configuration, armed with Starstreak HVM
-Armed with 25 mm cannon
-Mine layering configuration
-Armed 81 mm or 120 mm mortar
Read for more info here: Moddb.com