From OED:
Evacuation: to remove (someone) from a place of danger to a safe place, to cause the occupants to leave (a place of danger), or withdraw from (a place) ...
But, the Administration JUST CAN'T bring itself to say evacuation. Reduction in Staff or Ordered Departure somehow makes it more soothing to the American Public in the Adminstration's eyes ...
I just retired from State and at the US Missions (Embassy or Consulate, never an Annex) abroad it is actually called an ordered departure. Thing with this is that the liberal foreign service officer mind is bulletproof and they do not think danger or harm can ever come to them. They live in a fantasy world where politicians make great Social Changes by being in charge, but that there are no consequences. They hate the military, the other place I retired from because military people are pragmatic and understand the real world. I’m glad you posted though and I will like your definition a lot better - funny!!!!