There are a lot of interesting comments being made on the website of the group where the letter is posted. I doubt whether most will be up for very long.
http://www.militaryreligiousfreedom.org/2015/05/51415-propaganda-bonanza-for-isis-air-force-general-defies-law-by-witnessing-for-jesus-in-full-uniform-on-worldwide-tv-and-internet/
The author is getting his shorts hands to him.