> he knew that his actions were going to be investigated

I disagree - my take when I first read this was that this was likely a pervasive thing that senior people all did, and they all knew about it. This guy pissed off the wrong person and so they took him down. Same for the lying about credentials - I am sure everyone is like "hey Jim, did you want to apply for that promotion?" with the response of "I can't because I didn't serve long enough", and the final reply of "oh just make up the numbers, everyone does and they don't check".