Not a SEAL
UDT.
Seals and UDTs are one in the same. Ventura went to BUDs, which all Seals go through. At the time, 1970, he may not have gone through things like airborne training and the like, but he is a Seal.
Saying UDTs are not Seals is like saying Delta Force isn’t JSOC because they aren’t Seal Team 6. Both statements are incorrect.