While I think GP comment was a bit looney, the first sentence is a fairly weak counterargument. Xbox controllers especially are used specifically for familiarity purposes. The US military can and does produce significantly more advanced control planes, but they aren't necessary for all purposes and if something is simple enough it's easier to not have to train people on something new. Likewise creating an own general-purpose OS would require significant time into training people how to use it.

I'm not saying the movie War Games was a limited hangout for a super-intelligent secret military computer system/network that already existed. I'm just saying it could have been.

I see those trillion dollar data centers we're building in the US are classed as military installations or at least appear to be a public-private partnerships where the data centers are being built on air force bases.

Perhaps the consumer compute tech has advanced to the point that it's good enough to host the next phase of intelligence for the military. Maybe all the water AI datacenters need is for energy, not cooling.