¶1Opinion of the Court
¶2A special court-martial convicted the accused of two violations of the Uniform Code of Military Justice, Ar-tide 91, 10 USC § 891. We are concerned only with one of these, the *466specification of which alleges that the accused disobeyed an order “to get a haircut.”
¶3At the trial, it appeared that the accused in fact had his hair cut, but that this was not in accord with pertinent regulations. In his findings, the military judge modified the specification in question by inserting the word “regulation,” causing it to charge disobedience of an order “to get a regulation haircut.” (Emphasis supplied.)
¶4When acting as a fact finder, a military judge may amend a specification by exceptions and substitutions. He may not, however, change the nature of the offense charged by addition of new matter. United States v Hopf, 1 USCMA 584, 5 CMR 12 (1952). In the instant case, this principle was transgressed.
¶5The findings of guilty of specification 8 of the Charge are set aside. The record of trial is returned to the Judge Advocate General of the Navy. The Court of Military Review may reassess the sentence on the basis of the remaining findings of guilty.