The Air Force can easily afford to pay Silicon Valley salaries (sure the officers who are being taught to code can be paid less), but if the Air Force is artificially limited by red-tape to offer competitive salaries, wouldn't these software developers choose to leave as soon as they've learned?
The other issue is paying these officers competitive salaries, would have quite the ripple effect. Higher ranking officers would all need to get paid more, or software developers would need inflated ranks, but with some designation where rank did not determine command.
I have zero insight and am just speculating. If anyone has more insight I'd love to hear it.