Who else can it be besides Intel? I don't think it even needs to be "domestic", per se, it just needs to be in a country that isn't extremely likely to be invaded by China.
Hmm. I think it depends on the application. Defense isn't HPC, right? They can probably get by on 22nm or so for most applications, so GlobalFoundries might be able to handle it.
Or, heck, Texas Instruments might be able to handle some chips (obviously they aren't cutting edge on the digital logic process node side, but they so all the funky analog stuff and they'll keep making a design for, like, a bazillion years, which may be appealing to the military).
Giving a company even the vague belief, let alone the certainty, that it won't be allowed to fail is a stunningly bad idea.