pre-induction judicial review

§ 10(b)(3) does not foreclose pre-induction judicial review in that rather rare instance where administrative action, based on reasons unrelated to the merits of the claim to exemption or deferment, deprives the registrant of the classification to which, otherwise and concededly, he is entitled by statute; and § 10(b)(3) does foreclose pre-induction judicial review in the more common situation where the board, authoritatively, has used its discretion and judgment in determining facts and in arriving at a classification for the registrant.