Quote Originally Posted by Gilrandir View Post
One more option forgotten: smoke'em out with sarin.
Didn't address this because the USA doesn't have bioweapons and is actively destroying the last portion of our chemical weapons stockpile. While we have the knowledge and skills to produce either, we have abjured the use of these weapons while making clear our stance that any type NBC attack on the US might provoke a nuclear weapon response.

Sarin, as with most gas attack weapons, would be of limited utility in the cave/cavern scenario noted above anyway. All such defensive complexes are baffled and constructed so as to impede those kind of attacks anyway.