There seems to be lot going on here that doesn’t entirely add up. So both trainers put you up, but your Supe refused to do a check ride and suspended training anyways? With no justification? Then a TRB reviewed all this information and still decided to terminate your training? Then still, this same supe that just screwed you over and caused you to wash wrote you a letter of recommendation? Feel like there are details missing here but nonetheless, going to the NEST without any certifications is not a great position to be in. Maybe there’s a still chance you may be offered Flight Service in Alaska or something, but I wouldn’t expect anything more and would probably be prepared for employment termination.