There ar a few assumptions to be made. The UN vehicles tended to be workshop painted rather than whitewashed so the white didn't wear off so quickly & was usually more neatly applied. That said, there could be oversplash onto tyres & tools, which may have been removed. Wheels & lower hull may not get painted. White won't stay that way for long, with dust & mud splattering being very quickly apparent. Areas of high traffic will wear, showing the underlying camouflage paint quite quickly.
I'd use a fairly 'pure' white as a base coat, perhaps with a touch of dark blue or black, then a thin blackwash, highlighting with a very light gray & then dust, mud, rainstreaks etc to taste.
DCs comments not withstanding, I think this says
"now fuck off and behave" quite well!

And who makes figures for these?
