I once had a boss tell me there are many ways to fire someone without actually firing them. Just make it impossible to effectively do their job, and make their workplace so unbearably bad that they want to leave.
In other word, while the REGIME may not have actually fired them, they probably wanted to rid themselves of talented competent managers. They got what they wanted and the United States is much worse.
Also looking at the number of women officers leaving their posts, something tells me there was probably a plan afoot by the REGIME.
Where there's smoke, there is firing going on somewhere.