The District Court for the Eastern District of New York originally dismissed respondent's complaint seeking declaratory and injunctive relief against a regulation promulgated by petitioner limiting the length of a policeman's hair. On respondent's appeal to the Court of Appeals for the Second Circuit, that judgment was reversed, and on remand the District Court took testimony and thereafter granted the relief sought by respondent. The Court of Appeals affirmed, and we granted certiorari, 421 U. S. 987 (1975), to consider the constitutional doctrine embodied in the rulings of the Court of Appeals. We reverse.

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