In fact, the department of defense is far behind even the department of energy inside the US government on high performance computing, algorithms and machine learning.
Second, the Department of Energy isn't just a random department with a lot of spare computing power. They run the National Labs, and part of that work is to make supercomputing available to academic and industrial researchers too. These are also used for nuclear-related projects (part of the DoE's mandate, but obviously related to DoD concerns too) and I would bet that there is some mechanism to boot off academic researchers if the national interest suddenly required exaflops of computation,
I seem to recall that the DoE, NOAA, and NASA always had a lot of computing resources, and that they generally rented time on those clusters out to other government agencies.
I do wish the government would step up on AI though -- I think that they owe it to the country to put together a Manhattan Project for AI.
The Chinese government is leading (and funding) massive efforts in high performance computing and AI. If they win, entire high tech industries could be situated in (and lead by) China.
It actually works out better if the US government computers are through various science organization labs, because it locates much of their computing power in places also accessible to universities and at agencies amenable to US universities using their resources. So funding computers through the DoE, NOAA, NASA, etc actually makes them more available for the US research community, while allowing the military to lease the time they need (eg, for calculating explosion dynamics).
The total funding for US supercomputers also could be higher, but that's a general problem with US infrastructure investment.
My main point was there's no real concern with the computers being owned by scientific institutions instead of the military -- they're still government funded, it just makes them more widely accessible for use.
I hope we can come up with a better primary goal for AI than mass murder
Instead, they contract with academic and industrial researchers to work on specific things that are (or might someday be) of particular interest to the DoD. Thus, if there's a huge DARPA-funded breakthrough in Probabilistic Programming, it's going to have (say) Frank Woods' and Oxford University's name on it, not the DARPA program manager's. The final work might not even be published. They're happy to fund industrial groups if that lays the groundwork for products that the DoD eventually wants to buy.
https://cs.stackexchange.com/questions/37618/who-coined-the-...