First ,make sure that i mean by vonID the ability to see targets information when locked by launcher or another vehicle (vehicle's name and driver's ID)
I don't really know how to reproduce it,but this happens this way:
-You need to be present in the multiplayer's lobby while waiting for the mission to start.
-Difficulty should be set to veteran. veteran with vonID=1.
-When game starts,when pressing space and aiming a player,you can notice that you can see its name,and vehicles names,but if you quit the server and rejoin after you won't be able to get those informations while aiming a vehicle or player,while players that didn't quit have always this ability.