I’ve mad around 60-70 different Danish vehicles the last two decades, so I feel I may be able to help you there too. Some years ago I managed to get some authentic army color which I’ve used ever since. As this is not commercially available I can’t suggested this solution.
After having base coated my models with this, however, I go through a series of over sprays, hand painting and repainting of errors. And to this I have to mix colors that are close to the base color. And so, here are my suggestions.
For a base coat I’ll recommend a mix of the following Tamiya paint; XF-81 (Dark Green 2 RAF) with some drops of XF-4 (yellow green) and a few drops of XF-52 (flat earth). I can’t offer you specific mix ratios but compare with your reference (and remember – no two vehicles are alike especially when weathered). An alternative to this is a mix of Vallejo 327 Italian Tank crew and 70.888 Olive Gray; I am personally not a fan of airbrushing Vallejo colors but I know many who claim it is easy.
For shades I use Vallejo paints. Their two green shades, 76.503 and 76.512, actually work out fine with Danish vehicles too, especially .503. In addition to these I also mix Retarder, glaze medium with the following paints 70.893 , 70.894 , 70.823 , 70.888 and 327.
Hope this will sent you in the right directions .