[crote]

So it doesn't have a kill switch, it just stops being useful when it can no longer regularly phone home? That sounds awfully close to a killswitch to me...

[throwaway85825]

Countries could generate their own MDFs but what's the point, it's from shared intelligence. Which is the premise of an alliance.

Sometimes variances in manufacture or maintenance of electronic systems allow the F35 to identify not just type of system but exact unit.