[blam]

"This is sensationalist to the max."

I think you're right. His appointed term is expiring.

Not being re-appointed is not a firing.

[deport]

For what it’s worth Dept.........

snip
From the Washington Post article

.....
As is customary, Schwartz, like other presidential appointees, submitted a letter of
resignation to give the new administration a clean start. He had done so before, but
the Obama administration twice declined to accept.

The Trump transition team made the decision to accept Schwartz’s resignation,
according to a military official with knowledge of the situation.
end snip