Are the units you can command in the Halo Wars demo, all the units in the game?

[Reggie]

i'm considering buying Halo Wars, so i've played the demo. real fun, but there's one thing i'm not sure about after trying the demo..
are the units you can choose build and command in Skirmish, the same amount of units you can build / command in the full version of the game? or does the full version have a bigger amount of playable units
please tell!