Actually they do need to upgrade. The fact is that Vista has built in automated diagnostics that automatically fix issues and it is more secure. Both things that the Army or any government entity is very concerned with.
I was joking about how if the gov't agencies don't blow their entire budget they'll lose it and about how poor the Marine Corps is. I know both of these things - the Navy drops full payloads into the Pacific so they can buy more at fiscal year end and the MC naval aviation set up is ridiculously bad and slow - it just got worse since they "upgraded".