Why don't you just re-texture the jaugernaut with a hi-tech mask? (micro gas ventilator)
That way you don't have to bother the model or Jon, because you can do it yourself easily by editing the texture.
Just be sure to make a backup of the original before you replace it with your own.
The Jaugernaut Sniper has a mask on, just look at him and the regular Jaugernaut by changing their AIMAINs to default.fpi (so they stand still)
Also take note of the Edit link just under your Avatar on your post.
Using that will prevent the double posting, which is something else that some people fuss about.
Welcome and good luck.