This has been posted before, see # 19 here http://www.freerepublic.com/focus/f-news/2050314/posts
It is from Captain Jeffrey S. Porter. Also, it is all over the web. I searched using google for ‘Jeffrey S. Porter’ and ‘captain’ and the only hits I got were for this email. (Which could indicate it is fake.)
We need to verify that it is true, and if it is, make sure all the MSM get it and publicize it. If they don’t, we need to post it to all MSM blogs and anywhere else we can.
http://www.blackfive.net also has the letter from an Air Force captain at Bagram Air Base. If you scroll down the page, you’ll see it.