This is a little old but interesting nonetheless. Apparently in November, 2007 NATO’s international research and technology group conducted evaluations of several camouflage patterns at Fort Huachuca, Arizona.
The article can be read here at the Arizona Daily Star. A slide show of the photos is here.
Due to copyright issues I will refrain from posting anything but the link here. However, it is well worth your time to check it out if you are even a little bit interested in camo.