All those purged officers may provide a heads-up concerning junior officers available for promotion; and, unofficial background concerning their replacements. Who knows? They might want back into the game.
I’m really talking about purging the civillian side, the civil service bureaucrats. Within the military, I think when President Trump changes out Obama’s brass for his own, the rest of the military will fall in line, especially because 90% of non-coms and non-commissioned officers are pro Trump and lean conservative.