Tony
Just a WAG but perhaps they painted the ambulances in a single colour for the following reasons:
They did not want them mistaken for a tactical vehicle with camouflage. They wanted to appear less war-like.
They actually wanted them to be easily identified from other surrounding vehicles. Wishful thinking in an attack on a convoy situation but if operating individually may give some measure of protection.
The big crosses cause a problem as they negate any stealth ambitions. If a unit was actually trying to hide, the first vehicles to be covered with nets or branches would be the ambulances.
I suspect some people in the Medical Corps may even believe that the Ambulances should be all-over white as the Geneva Convention says you should not shoot at them. I think ambulances only get protection if it is convenient in the overall battlefield situation and the presence of an ambulance offers no safety to a unit under attack.
Lang
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