T-Dog, the box is on the throat where it would normally sit. They have a full covered box that is part of the vest Kevlar, so the collar box sits inside of it and then the straps feed through a slit and wrap around it he outside of the cut collar. So if the strap gets gets cut the collar can’t come off, and the box is entirely encased by the Kevlar. I see what you’re saying about it getting jammed in to their neck, I have not thought about that aspect before. From a mobility standpoint I have not seen any issues with it, doesn’t seem to hinder their movements at all.
I have not seen or thought about a box for the collar being on top, that would actually be ideal if they made this vest with that option and just had it on the back of the neck in a way that would not hinder their head movement. I’ve gotten a few good cuts that would have been directly on the collar had it not been covered, so far no issues. I could still see there being a problem if the impact was hard enough to break the solder on the GPS wire.
Here’s a better pic showing the collar box.

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