Military grade Lojack!
That ought to be standard military issue. Incorporate it in the essential electronics and seal it in a tamperproof enclosure.
I would definitely require it in tanks, helicopters, manpads, etc. I would also incorporate GPS into it so the asset could not be smuggled out of the theater. We don’t need manpads here!
I think any explosive on a friendly would be unsettling. How about a tracking chip? That way the vehicle pings an ID and can be targeted, if need be.