You can use their units init fields to set the faces.
like: this setFace "face001"
would let the guy look like the first face you can find
in the player setup menu, where you can choose your
face.
If you want to figure out the number of the faces, according
to their "lookalike", just have a look into the player setup
menu (ya know the one you can access from main menu),
and if you find some you wanna use, just use the simple
counting technique (ya know: 1 - 2 - 3 - 4 - 5) ;D
hope this helps
~S~ CD