I tried this technique with a small-scale SU-85 first, and it worked very well.
I painted the more inaccessible areas (suspension, wheels, hull underside) in green
first, as I assume that these areas would not be whitewashed (as the whitewash was
applied fairly hastily in the field, rather than in the factory, as far as I know).
Never thought of the chalk idea - the reason I painted the white first, then drybrushed with green, is that this way,
the green ends up on the edges and raised areas of the model, in the same places that the whitewash would wear off first.
Anyway, the KV-1 now looks really good - all it needs is some rust on the tracks and it'll be done!
It's certainly the most weathered vehicle in my collection so far..
About the LAV-25 scheme - again, does anyone have any ideas of the date/location for its colour scheme?
I'm guessing it's one based in the US, rather than in a particular conflict, but I'm not sure. LAV-25s
were used in Desert Storm AFAIK but I think they were painted in overall Desert Sand colour.