Probably not really helpful, besides a bump on the post.
I got off the phone with Leupold today and they currently do not have a Mil version VX6hd and cannot get one modified/customized. I didn't ask if they did in the past.
I wished they would as I would buy a 3-18x50 asap. They do currently offer a VX-5 in mils.
Good luck with find.