Purge

Some outlets are reporting these as resignations but more likely they are firings.

The entire senior level management team at the State Department was fired by President Donald Trump’s administration this week, CNN reported Thursday.

CNN’s Elise Labott reported on air that officials told her four top State Department staffers were informed in letters sent by the White House that their service was no longer required. The pro forma resignation letters typically submitted by the heads of federal agencies at the start of new administrations were accepted.

Probably more coming across other departments. Loss of "institutional memory" at State in particular tends to make people the most nervous, though.