I can only speak from the US military perspective but that mask is not the image we try to project. We are in a profession of arms. We emphasize the profession and employ the arms when we must. Sure in videogames our weapons and tactics are badass. This is real life right here.
Beside the fact that it would be an unauthorized uniform item. We call them uniforms because they are all the same. Can’t be blinging em out. Of course this is the French..