"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
Paul - For the base sand colour I used Hobby Color H318 Radome darkened down with Taimya XF57 Buff and XF59 Desert Yellow. The green is Hobby Color H405 Olive Green with the brown being Hobby Color H47 Red Brown.
Specifically about "Schnuck" there were a lot of controversy about color scheme. A lot of references have the meaning "Schnuck" were always grey, but a original pic of "Schnuck" shows a camouflage scheme. But I would say (looking on this pic) that all upside must be grey...