As someone who did ten years in the Air Guard, it really ticks me off when people impugn another Air Guard vet.
Short answer: As someone who handled paperwork every drill as a shop chief, I've seen all the uploaded records of Bush's service.
He volunteered enlisted admin, went to basic, came back, volunteered as a pilot, took UPT (Which requires a degree, perfect vision, balance, reflexes, and can't be done as a "favor." You're either physically qualified to be a pilot or you are not), flew an F102, which was not the safest bird in the sky, for a unit that had ALREADY deployed to 'Nam and come back once.
To try and explain the details of his last year (Which was a bit short...so was mine) would take a few pages, but it was neither abnormal nor questionable. On this subject I can state confidently I know more about it than you do, and if you think otherwise you're wrong.
Unless you also were an Air Guard shop chief and have seen the documents.
The majority of the US military in the 60s did not serve in Vietnam. There was this little thing called the "Cold War" involving potential nukes flying around that ate up most of the troops.
I really HATE the "Well, he served, but he was GUARD/he was active, but not Army/he was Army, but only a REMF/he was infantry, but never got any 'professional' certs such as Ranger/never 'took advantage of his opportunity to serve in combat'" BS. Especially since it usually comes from people who never served in ANY capacity.
You want a scheming coward, try clinton. Bush is as much a vet as I am.