Just for the record... the press is addressing Kristi Noem's departure as a firing.

I don't think so. - John F. Di Leo

• Remember in Peggy Noonan's memoir, how she spent some time talking about how the average tenure in a presidential administration was (then) about 18 months. 

It does make sense...

Kristi has been terrific in this role... and she's being appointed this weekend to be head of the "Shield of the Americas", a new defense initiative in the foreign policy space.

• Doesn't sound like a firing to me. 
• In the second year of an administration, this sounds like a normal move to me. 
• Lateral... and a well-deserved break in my opinion.

My opinion, anyway.
John F Di Leo