Military GMTK?

Question for you military guys and gals out there, does anyone know why the GMTK's cost so much? Are the tools in these kits different from what is sold in the stores? I was looking at buying a good mobile tool setup since lately I have been doing quite a few vehicle repairs at peoples homes or on the road and came across a number of sites listing these kits. I see the kits are farmed out from a few different suppliers like Craftsman, Crescent, S&K, etc. and they come with those great Pelican cases but why the heck the huge price tag?