Until I bought my stamps I did not know that the MOH comes in 2 versions — Army and Navy. I imagine that the Marines use the Navy version, but what about the USAF? Does anybody know?
what about the USAF?
Those are for Air Mail...
Affirmative that the Marines use the Navy version as well as Coast Guard but as you point out, what do the USAF awardees get depends upon 'when' THE MEDAL is awarded. I refer you to this listing from the semi-official Air Force Magazine to show that, of the 60 airmen awarded the MoH, 42 were prior to the official separation (1947) of the USAF from the Army (Air Corps). For them it was obviously the Army MoH version as it was for the Korean War as well.
In 1965, the US Congress and USAF authorized a specific design and thus the Vietnam War awardees were the only members to receive this design (no airman has been awarded since Vietnam). As to why the USPS / Post Office chose not to include the USAF design, ask them. My presumption is that there would only have been a maximum of 14 Air Force design MoH versus the thousands of MoH recipients, but I wasn't asked nor in anyway involved!
...........the link below will answer your questions with pics and facts....................
http://www.afhso.af.mil/topics/factsheets/factsheet.asp?id=15196