Great job, never tried to do a white AFV (other than whitewash).
I think the white is like a hunter wearing blaze orange- it's shorthand for 'DON'T SHOOT ME'.
The White UN stuff pretty much is exactly that. Of course the warring factions have to respect those rules, and the forces deployed have some sort of back up and the folks in charge willing to use that back up rapidly if need be. If they dilly dally and deliberate, thats one reason those ops can go sideways in a real hurry.