Is the majority of the DoD employees going to use touchscreen computers? If not, the Metro interface will just get in their way, and they'll need some retraining, too. If anything they should've gone with Windows 7. I think it's supported at least until 2020 (and if Windows 8/9 doesn't catch off, probably longer).

Also, the deal makes it to about $2,000 per user per 3 years. Isn't that...expensive? How much would the taxpayers have saved if they had gone Linux?