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Here is some good, concise advice on the matter.
http://www.bcforestsafe.org/files/Split%20Rim%20Safety%20July%2017.pdf
They recommend, for REMOVING wheel assemblies, to deflate first, then loosen lug nuts. Makes sense, because you do not know for sure if the tire has been abused at low air...
Just be careful...they are starting to look too good for something that goes onto a military vehicle! You may have to take a rattle can and do some overspray on the tires so people can go "Oh, yes, that IS military original!"