Crian ... no alpha channel tricks were used in the making of the headless zombies. MTW2 allows for different physical meshes in the same model...which it randomly puts together to make unit variations. The stock game uses it to put different helmets ans shields on the soldiers ... the same trick can bu used to put a stump of a neck in place of a head.

It's one of the things that mae kthis game engine so much nicer to mod with