Since Vindman isnt the whistleblower he can be fired...providing Trump can jump through all the govt. hoops
I am pretty sure most NSC are not covered by any civil service protections, same as intel, law enforcement, lawyers and oddly enough civilian instructional personnel such as civilians who teach at the USMA and the other academies.
While we are waiting for that unlikely event (firing), transfer him and his twin brother to the Pentagon where they can shuffle papers for purchases of new portable commodes for the troops.