Opinion of the Court
PERRY, Judge: *The appellant was convicted by a general court-martial consisting of military judge alone of 11 specifications which alleged, variously, the possession, sale, use, and transfer of heroin, in violation of Article 92, Uniform Code of Military Justice, 10 U.S.C. *333§ 892. He was sentenced to a dishonorable discharge, confinement for 3 years, forfeiture of all pay and allowances, and reduction to the lowest enlisted grade. The convening authority approved the findings and the sentence, except that he reduced the period of confinement to 30 months. The United States Air Force Court of Military Review affirmed. We granted review to consider the appellant’s claim that the military judge should have recused himself after appellant withdrew his earlier pleas of guilty because of government misconduct. Under the facts and circumstances of this case, we conclude that the trial judge erred in continuing to act as factfinder in a court-martial before judge alone. We reverse.
I
After the appellant had tendered pleas of guilty to 8 of the 11 specifications laid against him, the judge proceeded to advise the appellant as to the full meaning and effect of his pleas.1 Then, after a thorough providency inquiry, during which the appellant unequivocally affirmed matters contained in a prepared stipulation of fact and admitted his guilt, the judge accepted his pleas and entered findings accordingly.
Subsequently, trial proceeded on the 3 specifications to which the appellant had pleaded not guilty. During the course of this litigation, the defense uncovered, through cross-examination of a government agent, that the Article 32, 10 U.S.C. § 832 investigating officer2 had considered witness statements which purported to be sworn but which, in fact, were not sworn and which the agent knew were not sworn. At this point, the defense counsel moved to withdraw his client’s guilty pleas to the other 8 specifications and the judge, determining that good cause was shown, granted the motion and entered pleas of not guilty to all specifications. Following the judge’s denial of defense motions for dismissal of all charges and specifications and for other appropriate relief based upon the perceived government impropriety, the defense counsel moved for the recusal of the military judge. The judge likewise denied this motion but permitted the appellant to consider whether he wished to withdraw his request for trial by judge alone. The appellant declined to withdraw his request.
II
Whether to grant a challenge for cause against the bench and whether to recuse himself on his own motion are matters left within the sound discretion of the trial judge.3 But paragraph 62f(10), Manual for Courts-Martial, United States, 1969 (Revised edition), cautions the judge that he should not sit if “he has formed or expressed a positive and definite opinion as to the guilt or innocence of the accused as to any offense charged . . .” And subsection (13) of that same paragraph admonishes like action whenever there are “[a]ny other facts indicating that he should not sit as . military judge in the interest of having the trial and subsequent proceedings free from substantial doubt as to legality, fairness, and impartiality.” Similarly, the ABA Standards, The Function of the Trial Judge, § 1.7 (1972), advises:
The trial judge should recuse himself whenever he has any doubt as to his ability to preside impartially in a criminal case or whenever he believes his impartiality can reasonably be questioned.
The drafters of this provision explained in the Commentary appended thereto that
the trial judge has an obligation to recuse himself whenever necessary to protect the right of the accused and of the public *334to an impartial trial. Canon 3 C(1), Code of Judicial Conduct (Final Draft, May 1972). The appearance of bias or prejudice can be as damaging to public confidence in the administration of justice as would be the actual presence of bias or prejudice. Orfield, Recusation of Federal Judges, 17 Buffalo L.Rev. 799 (1968).
See United States v. Head, 2 M.J. 131 (C.M.A.1977).
Simply because a judge possesses — and has expressed, even publicly — predilections on an issue of law to be litigated before him does not mean that the judge is disqualified to sit and to resolve such issue. Laird v. Tatum, 409 U.S. 824, 93 S.Ct. 7, 34 L.Ed.2d 50 (Memorandum of Mr. Justice Rehnquist) (1972). As well, simply because a judge may have been made aware of certain factual circumstances involved in a case does not necessarily mean that he is disqualified to continue to preside. See United States v. Hodges, 22 U.S.C.M.A. 506, 47 C.M.A. 923 (1973), where the judge revealed that he had learned from a third party that the accused had sought a pretrial agreement with the convening authority which never came to fruition, but disclaimed any knowledge of the specifics of the negotiations and insisted that his knowledge of the accused’s attempt would not affect his impartiality. This is true even when the judge has gained knowledge regarding the circumstances surrounding the offense itself through judicial inquiry into a guilty plea tendered by the accused but later rejected by the judge because the accused in the inquiry had set up matter inconsistent with guilt. See United States v. Shackelford, 2 M.J. 17 (C.M.A.1976); United States v. Melton, 1 M.J. 528 (A.F.C.M.R.1975), pet. denied 2 M.J. 159 (1976); United States v. Cockerell, 49 C.M.R. 567 (A.C.M.R.1974), pet. denied 23 U.S.C.M.A. 640 (1975). Mere exposure to such information does not necessarily cause the judge to have reached any conclusions about the accused’s culpability and legal liability (see paragraph 62f(10), Manual, supra) and the judge’s “philosophical credentials [as a trained jurist] are sufficient to bar the appearance of impurity . . . ” (see para. 62f(13), Manual, supra). United States v. Hodges, supra, 22 U.S.C.M.A. at 508, 47 C.M.R. at 925.
But “[t]he disciplined judicial mind should not be subjected to any unnecessary strain; even the most austere intellect has a subconscious.” United States v. Walker, 154 U.S.App.D.C. 6, 8, 473 F.2d 136, 138 (1972). Cf. United States v. Wright, 5 M.J. 106 (C.M.A.1978). In a case such as this, where the judge not only has gained detailed knowledge of the factual basis for the offenses charged but also necessarily has been required to reach certain conclusions regarding an accused’s factual and legal guilt — and to have manifested those conclusions by having accepted pleas of guilty and entering findings of guilt — both the fact and the appearance of “impurity” are presented by the judge’s continuing to act as the factfinder in the trial. See United States v. Jarvis, 22 U.S.C.M.A. 260, 46 C.M.R. 260 (1973); United States v. Melton, supra; United States v. Cockerell, supra.
We hold that the judge in this case abused his discretion by continuing to preside in this trial by judge alone. Properly, he should have either recused himself from the trial entirely or, as an accused has no right to insist on trial by judge alone,4 directed a trial by members.5
The decision of the United States Air Force Court of Military Review is reversed. The findings and the sentence are set aside. The record of trial is returned to the Judge Advocate General of the Air Force. A rehearing may be ordered.
Chief Judge FLETCHER concurs.Judge Matthew J. Perry took final action in this case prior to his resignation as a judge of this Court pursuant to his appointment and confirmation as a United States District Judge for the District of South Carolina.
. In part, the judge informed the appellant that [a] plea of guilty is the strongest form of proof known to the law. And on your plea alone, without receiving any evidence, this court can find you guilty of the offenses to which you plead guilty, and impose sentence. Your plea will not be accepted unless you realize that by your plea you admit every element of these offenses to which you indicate you propose to plead guilty, and that you are pleading guilty because you really are guilty.
. Article 32, Uniform Code of Military Justice, 10 U.S.C. § 832.
. For an excellent analysis of the trial judge’s “discretion” — its forms, limits, and rationale— see Rosenberg, Appellate Review of Trial Court Discretion, 79 F.R.D. 173 (1975).
. United States v. Ward, 3 M.J. 365 (C.M.A.1977). Accord, United States v. Bryant, 23 U.S.C.M.A. 326, 49 C.M.R. 660 (1975); United States v. Morris, 23 U.S.C.M.A. 319, 49 C.M.R. 653 (1975).
. Even directing trial by members, .however, is not foolproof. See United States v. Shackelford, 2 M.J. 17 (C.M.A.1976), for “a turn of events [which] serves to illustrate the unforeseen risks which often accompany a refusal to step off a case once on notice of a version of the facts to which the actual factfinders are not entitled to be privy.” Id. at 20 (footnote omitted).