> and could get past antitrust by arguing military security

Antitrust would certainly block Apple specifically for this reason. Apple is not a credible supplier of DoD hardware and acquiring IFS would complicate their status as a Trusted Foundry.

If Apple had more time to reform their image and invest in MIL-STD processes then maybe it would work. As-is, I'd be shocked if the US let Intel become the victim of a hostile takeover. Even for a company as important as Apple.