Notes on ambulance interior colors, in my research for my ongoing and onrusting M725 ambulance project:
Most ambulance interiors are seafoam green, but there are two exceptions to the rule, detailed below.
When an ambulance comes from the factory, the interior of the box is seafoam green. No if ands or butts.
However, if the ambulance is to serve in a forward support role, as in Korea, Germany, or any other "hot spot", it is at the discretion of the forward support unit to repaint the interior of the ambulance a more subdued color, such as 24087 OD green.
If the ambulance is to serve in the complete opposite environment, such as being attached to a medical facility or army hospital (Walter Reed in DC, etc.) it is at the discretion of the facility to repaint the interior of the ambulance semi-gloss white, in order to provide a more bright interior.
The majority of ambulances never are repainted on the inside, and stay seafoam green their entire lives. But the few medical personnel I have spoken with that have experience with these ambulances in the service told me the above info.