You won't make any money like that, son
> If I would need to select between Windows XP and a Linux based system while building a military system, I wouldn't doubt a second which one I would take."
Nope, neither would anyone else supplying softs to that source of infinite amounts of moolah.
Linux is definitely the worst choice possible. Imagine installing a reliable, low cost and easily supportable infrastructure. Whereas everyone knows that to make money from military contracts you MUST specify the most expensive, inadequately implemented and personnel intensive products available. Otherwise your margins will be terrible and you won't be able to cash in on the ongoing support, mandatory suckurity upgrades, and constant bug-fixes (all at an hourly rate) that is where the real profit traditionally lies.
[Afterthought: though maybe the supplier is *still* charging for support at "windows" rates and has forgotten to mention to the suppliers of pork that their new system can be supported by a 14 y/o on a few pesos a day]