That would have to be a stuxnet-level targeted sting operation, with a general purpose LLM exhibiting some ridiculously specific behavior in ridiculously specific circumstances, in such a way that nobody catches it in testing (and none of the other zillions of users of that general purpose LLM notices anything odd). If you're so paranoid that you do a blanket ban rather than just saying "hey guys maybe double check before using Chinese software in weapons we plan on maybe pointing at the Chinese", frankly LLMs should be the least of your worries, supply chain wise. Every US government employee uses a phone made in China (because they all are), and the president doesn't even update his, so color me skeptical that this has anything to do with security posture.
Now you know how much testing happens in defense systems. Or, more accurately, the quality of the testing regime, in defense systems.
That said, totally agree. There's no way this was fueled from actual concern. They're just nervous about the needles drifting next to the bubbles full of money.
But about that supply chain . . . . <nervous_whistling.wav/>