Elections have consequences. These are political appointee jobs and normally ALL are replaced. Very likey the Dem ranks aren’t overflowing with political types whose military experience can fill the remaining slots any time soon. (remember WHO got shunted off from the White House to the Pentagon? THAT is the Dems idea of a Pengagon politcal appointee)
They don’t care about qualifications.
They want “yes” people who fit their ideology which doesn’t have to be for the good of the country.