Originally Posted by
rickair7777
Stick with the TSA-approved documents for this purpose. A military ID is not approved IIRC, because you can be a military member without citizenship (yes we all know you must be a citizen to be a commissioned officer, but TSA doesn't allow CFI's to extrapolate citizenship from military rank).
FWIW, one must be a citizen to be promoted to E-4. I had to reduce a soldier from E-4 to E-3/PFC. I didn't like it because he was one of the better soldiers in my company.
I think the reasoning was E-4, depending upon the military branch, is the lowest pay-grade at which one can be a NCO.