China has like ... millions of prisoners, presumably being brain-washed and worse... wouldn't be hard to maybe coax them into becoming spies and immigrating here, and just causing turmoil.

Starting forest fires ... or doing some sort of home-made drone attacks against infrastructure (power grids, gas-lines, trains, etc) ... all china needs is for us to decline, not full scale war.

That's just what china might do... we've got plenty of enemies... but I still think the military is way bloated, and doesn't need half the $$ it has, because if it were guerilla tactics like this, it'd be a hard fought battle no matter how much money is thrown at it.

There's way more vulnerabilities facing us with climate change, etc than missile strikes IMHO...