NASA fly's some of them, When I went thru UPT at Willy there was an F-5 ( T-38 on steroids ) training sqd that trained foreign pilots how to fly the Tiger II ( F-5) . On my second T-38 Solo I was re-entering the pattern coming up high initial and a mexican pilot stalled a F-5 in the final turn... no flap...no slats.. it stalled and rolled over on its back.... smoking hole in the final turn.... NOW that will get the attention of a solo student....!!!