Dear General Monty,
It is not very difficult to do. The key to getting it to look right is to look at photographs of real uniforms. I found a picture of the pattern on the internet and enhanced it in Photoshop so that the colours are much brighter. I do not know the pattern repeat but I would guess that the picture is about a square metre of fabric. Here it is, in my Flickr gallery.
link
The base colouring is a mix of brownish khaki, green, khaki yellow and sand colours. I used Vallejo US Field Drab 70.973, Luftwaffe Camo Green 70.823, Middlestone 70.882 and Iraqi Sand 70.819. You could substitute other colours as the exact shades are not vital.
Paint the whole figure in Middlestone, and then add blobs of Green and Field Drab. Next, drybrush the whole thing with Sand.
Compare the result with photographs and adjust until it looks right. Using very dilute paint add more patches of Brown, Middlestone, Green and Sand until you are happy with the result.
Then I added small dots and squiggles in "almost white" (GW Bleached Bone mixed with GW Skull White) and black (GW Chaos Black). Note that on the real uniforms, these appear as horizontal groups of dots and squiggles.
I used Army Painter Strong Tone applied very thinly with a brush to black line the details. If I were to do some more, I would probably use GW Devlan Mud wash. I suggest that you dilute the wash and apply in thin layers, until you are happy with the result.
When I first did the figures, I also painted the parts of the weapons in camouflage colours. Unfortunately this looks wrong and makes it very difficult to see what they are carrying. I repainted them using black with a small amount of GW Chainmail.
Mick
wonders if he can use his 3Dprinter to make markers.
