Well, I've gotten pretty much the expected responses on the other forum, and from the expected parties. The forum is primarily about wine and food, which is why I joined it to begin with (before I came to FTF).
Several commentors had doubts as to the letter's authenticity, and questioned why the names of the signers were not revealed; one said an opinion by an anonymous group of ex-military folks carried no more weight than anyone else (Commentator claims to have spent 5 years in the military carrying an assault rifle, so he "knows one when I see one". I didn't even waste my time replying to them, as it wouldn't make any difference.