First off, I enjoyed it. I like to read an origin retelling every once in a while.
However, there were a few USAF fumbles. Not the least of which is that there is no way in hell he could steal a jet and go for a joyride. If a jet gets turned on, and it's not scheduled to fly, it's a hijacking. It's a pretty big fucking security violation. In order to do this, Hal would have to be a close enough friend to the ground maintainers, the air traffic controllers, the military police (and possibly a few more groups);to be able to convince them all to let him do this the morning after he decided to get discharged.
Yeah, good luck with that.
(And no, he hadn't pulled strings with a buddy in plans and scheduling because then he wouldn't have taken an unauthorized joyride, he'd have taken a normal scheduled flight.)
Not just that, I can fucking guarantee that if a pilot hijacked an experimental fighter jet and then punched his commanding officer in the face, he wouldn't be at his mother's hospital room without an armed escort. But I can ignore that one, since the writer wisely didn't let us know how much time had elapsed between the punch and the hospital scene.
Still, no fucking way on the "unauthorized joyride". You overplayed your hand there, Johns.
Otherwise, it was a fine issue. I'm especially fond of Jim Jordan. I hope that character stays in the supporting cast for a while.