Here is how I would likely approach the issue...

If a General were to issue an order that my Soldiers were not to wear body armor, then would I be required to enforce that? I don't think so, because it would deny them a reasonable measure of protection for no apparent reason. As the "commander on the ground" that would be my call.

That seems pretty analogous to the interpreter's mask and while he is not one of your Soldiers, he is definitely an asset in your unit and an individual for whom you are responsible.

Can any JAG's out there tell me if I'm way off base with this reasoning?