I. Introduction
Appellants participated in a pre-arranged entry upon the Naval Submarine Base at Bangor, Washington, to protest the Government’s maintenance of the Trident weapons system. Their joint trials, convictions, and respective sentences and probation terms give rise to the several issues in this consolidated appeal. We affirm all the convictions and remand for adjustment of only the sentence imposed upon appellant Lowe.
II. Facts
In October of 1979, appellants (hereinafter also called “defendants”) and others who shared in their beliefs staged a demonstration at Bangor. During the demonstration, which was one of a series there, 110 protestors climbed over a boundary fence and were arrested without resistance as they walked toward the base. They were charged by information with violation of 18 U.S.C. § 1382, which prohibits, inter alia, entry upon Navy property for any purpose prohibited by regulation.
Two trials followed: Defendants under age 26, who were subject to the Youth Corrections Act (YCA), were given a jury trial, and those over 26 were given a bench trial. All defendants admitted intentional, non-permissive entry upon the base, and the principal defense attempted at both trials was one based on necessity and international law. The district judge disallowed presentation of this defense as a matter of law.
All defendants were convicted and fined and sentenced variously, apparently depending upon the age and prior record of each. Lowe, sentenced under the YCA, was given an indeterminate sentence of up to six years. Adult offenders were given up to six months, the statutory maximum. Most of the sentences were suspended, and appellants were ordered, as a term of probation, not to come within 250 feet of the base regardless of whether they had permissive use of private property within that 250-foot radius. This probation term prevented them from engaging in otherwise legal anti-Trident activities which were regularly conducted around the perimeter of the base, including distributing leaflets on the adjoining public roadway and attending weekly meetings at “Ground Zero,” a gathering place on private property adjacent to the base.
III. Issues
The following issues are presented on appeal:
A. Youth Corrections Act
1. Whether YCA commitment for a longer term than the maximum adult sentence for the same offense is permissible.
2. Whether the offense as applied to Lowe is an infamous one requiring a grand jury indictment, where the potential YCA sentence is for more than one year.
3. Whether Lowe’s decision to proceed pro se was knowingly and intelligently .made, where the magistrate did not specifically inform her of the potential six-year YCA sentence.
4. Whether YCA commitment was appropriate where the trial court made no express finding of benefit- to Lowe.
*565B. Basis for Sentencing
1. Whether the trial court relied on the erroneous assumption that Wind had been involved in prior criminal trespass activity.
2. Whether Wind’s sentencing properly proceeded absent a pre-sentence report.
C. The Necessity Defense
Whether the trial court erred in prohibiting presentation of the defenses of necessity and international law.
D. The Brobation Condition
Whether the probation condition prohibiting entry upon public and private property within 250 feet of the base was proper.
IV. Discussion
A. Youth Corrections Act
[1] Since the trial and sentencing of Lowe, this court has decided in United States v. Amidon, 627 F.2d 1028 (9th Cir. 1980), that the YCA was not intended to impose longer sentences upon youthful misdemeanants than would be available for adults convicted of the same offense, regardless of the rehabilitative purpose of such an extended sentence. Counsel for Lowe and the Government concede that Amidon is controlling in this case and that Lowe’s six-year sentence must be set aside. We agree. Because the record does not clearly indicate what sentence the trial judge would have imposed had he known the six-year YCA sentence was unavailable, we remand for resentencing. The six-year sentence being hereby set aside, the questions of whether an indictment was required and whether the decision to proceed pro se was made with full understanding of the potential six-year sentence are moot.
Lowe also contends that a YCA sentence may not be imposed without an explicit finding that the defendant will benefit from YCA treatment. We decline to speculate as to whether the trial judge will again find a YCA sentence appropriate in Lowe’s case given the proscription in Amidon against extending YCA sentences beyond the maximum adult term. Accordingly, we do not decide the question of whether a benefit finding is necessary in YCA cases.
B. Basis for Sentencing
Wind argues that her sentence was premised on erroneous information and that she was prejudiced by the absence of a pre-sentence report. The record indicates that the trial judge imposed prison terms upon defendants with a history of prior fence-climbing. Those who had never before engaged in such activity were given suspended sentences and probation. Wind was given a 45-day sentence of imprisonment. She claims that the trial judge erroneously considered her prior arrest for crossing the fence at Bangor, since the charge stemming from that incident was dismissed.1 Wind claims the trial judge was mistaken when he gave her the same type of sentence as those defendants who had prior convictions.
Wind, who represented herself below, informed the trial judge that she had climbed the fence at Bangor before. She also told him that the charge was dismissed. The record shows that Wind had full opportunity to explain her prior activity at Bangor.2
*566The trial judge has broad discretion in sentencing decisions. See United States v. Wylie, 625 F.2d 1371 (9th Cir. 1980), cert. denied, 449 U.S. 1080, 101 S.Ct. 863, 66 L.Ed.2d 804 (1981). While Wind argues that the judge mistakenly believed her prior conduct was criminal, this is not clear from the record. The judge knew the charge against Wind was dismissed. The judge could have considered her prior protest activity as indicative of the depth of Wind’s commitment and the likelihood of a repeat offense. The deterrent effect of a short prison term may have seemed necessary to reduce this likelihood. Thus, the prior conduct, even if it was not found criminal, could legitimately have been considered in the sentencing decision. Cf. United States v. Morgan, 595 F.2d 1134, 1135-1137 (9th Cir. 1979) (sentencing judge may consider wide range of information, including underlying facts relating to prior acquittals). Absent any indication that the trial judge used the fact of Wind’s prior activity for an impermissible purpose, or that he was otherwise misinformed, we have no basis for vacating the sentence. Cf. Farrow v. United States, 580 F.2d 1339, 1359 (9th Cir. 1978) (sentence upheld where there was no affirmative evidence that the sentencing judge relied upon false information).
In addition, Wind contends that the trial judge would not have been misled by her prior arrest if a pre-sentence report had been made. She further contends that her failure to request a pre-sentence report should not be held against her because she was a pro se defendant. Because we find no evidence of reliance on erroneous information, and because Wind does not suggest any other way in which a pre-sentence report would have changed the sentence imposed, we need not reach the question of whether the trial court properly relied upon Wind’s waiver of a pre-sentence report. We hold that Wind’s sentence was within the discretion of the trial court. The sentence is hereby affirmed.
C. The Necessity Defense
Defendants stipulated to the facts of the offense. Their only defense was that their actions were justified because the Trident system would lead to the devastation of civilization and because the 'system constituted aggressive warfare in violation of international law. Thus, under the common law' principle of necessity, defendants argued that their unlawful actions were necessary to prevent a greater, imminent harm.
Defendants submitted this defense in trial briefs and made an offer of proof as to the facts they hoped to prove in support of the defense. The trial court disallowed the defense as a matter of law and refused to receive supporting evidence which would have included expert testimony on the dangers of nuclear proliferation. Those tried to a jury were not allowed to argue the necessity defense to the jury.
In a similar case arising out of earlier Trident protests, this court rejected the defense of necessity. United States v. May, 622 F.2d 1000 (9th Cir.) cert. denied, 449 U.S. 984, 101 S.Ct. 402, 66 L.Ed.2d 247 (1980). This court in May found no direct harm to the protestors which would trigger a necessity defense. Further, this court characterized the defense as a “back door” *567attempt to attack government programs in a manner foreclosed by the standing requirement of Schlesinger v. Reservists Committee to Stop the War, 418 U.S. 208, 94 S.Ct. 2925, 41 L.Ed.2d 706 (1974). Appellants would distinguish May, noting that in May the district court had allowed a full presentation of the necessity-international law defense and that the Ninth Circuit panel had a complete factual record upon which to base its finding that the defense was insufficient.
Defendants did not proffer evidence that conditions have changed significantly since the May case was decided. Their offers of proof did not indicate that new evidence would be submitted which would negate the reasoning in May. Accordingly, the trial judge properly relied on May in holding that, as a matter of law, the necessity defense could not succeed. It was not necessary for the judge to receive evidence already held legally insufficient by this court. It was enough that he considered the trial briefs and allowed the offers of proof. On this record we hold, as did the trial judge, that the necessity defense could not possibly prevail. The convictions of defendants are affirmed.
D. The Probation Condition
The court below suspended the sentences of those defendants without prior records and imposed a probation term forbidding them to come within 250 feet of the base. The court knew that defendants would thereby be unable to distribute literature to Bangor employees on .the public roadway at the entry to the base or to attend weekly meetings at Ground Zero. Defendants argue that the probation term violated their first amendment rights of free speech and association.
This court has recognized that the sentencing judge has broad discretion in setting probation conditions. See United States v. Consuelo-Gonzalez, 521 F.2d 259, 264 (9th Cir. 1975). Exercise of this discretion is reviewed carefully where probation conditions restrict fundamental rights, but such restriction is permissible. Id. at 265. The test for validity of probation conditions, even where “preferred” rights are affected, is whether they are primarily designed to meet the ends of rehabilitation and protection of the public. Id. at n. 14. Similarly, this court hag stated that
The conditions must be “reasonably related” to the purposes of the Act. Consideration of three factors is required to determine whether a reasonable relationship exists: (1) the purposes sought to be served by probation; (2) the extent to which constitutional rights enjoyed by law-abiding citizens should be accorded to probationers; and (3) the legitimate needs of law enforcement. (Citation omitted.)
United States v. Pierce, 561 F.2d 735, 739 (9th Cir. 1977).
In Malone v. United States, 502 F.2d 554 (9th Cir. 1974), cert. denied, 419 U.S. 1124, 95 S.Ct. 809, 42 L.Ed.2d 824 (1975), this court upheld probation conditions which restricted free speech and association. In that case the probationer, who was convicted for illegal arms exportation, was forbidden from associating with any Irish or Irish Catholic organizations, from visiting Irish pubs, or from participating in the American Irish Republican movement. The court found that these limitations were reasonably related to the accomplishment of public order and safety. Id. at 557. In Malone the sentencing court found it necessary to limit the defendant’s contacts with the Irish community because the defendant’s gunrunning activities evolved from uncontrollable motivations and emotions. Because defendants in this case acted deliberately rather than emotionally, they argue that limitations on their movement and association do not serve the ends of rehabilitation or deterrence. We disagree.
Precisely because defendants here acted purposely, it is likely that they will be disinclined to cross the 250-foot line. The probation condition reasonably meets the goal of keeping the peace and deterring further criminal activity. The sentencing judge did not forbid participation in the anti-nuclear movement, nor did he forbid further anti-*568Trident speech. Rather, he forbade approach to the base. Climbing the fence was the particular offense he intended to prevent. Keeping the defendants away from the fence was a logical means of prevention.
Appellants argue that the 250-foot limit is arbitrary and that there is no reason to choose 250 feet over a greater or lesser distance, or a simple proscription against further fence-climbing. Absent compelling reason for appellate interference, the task of line-drawing in probation matters is best left to the discretion of the sentencing judge. Given the alternatives of imprisonment or some other greater restriction upon appellants’ movements, speech, and association, the 250-foot limit is reasonable. It is not so great as to prevent all protest activity; yet it allows law enforcement officials a buffer zone in which to detect probation violations and discourage repeat offenses before would-be trespassers are upon the fence. While such limitation would, of course, be improper if imposed upon the ordinary citizen, probationers “properly are subject to limitations from which ordinary persons are free.” United States v. Consuelo-Gonzalez, 521 F.2d at 265. The probation condition is affirmed.
V. Conclusion
The convictions of all appellants, the probation condition imposed on those who received suspended sentences, and the sentence imposed on Wind are AFFIRMED. Lowe’s sentence is vacated and that case REMANDED for resentencing.
. Wind states on appeal that the charges stemming from an earlier May 22, 1978 protest were dismissed under the authority of United States v. Patz, 584 F.2d 927 (9th Cir. 1978) (holding that conviction under 18 U.S.C. § 1382 may not be premised upon state law). She thus argues that her prior activity was not criminal. The Government suggests that the prior activity was criminal but that the charge was defective. In either case our analysis here remains the same.
. The exchange between Wind and the court at sentencing included the following:
THE COURT: Prior to last October, had you ever been to the Trident Submarine Base at Bangor, Washington?
DEFENDANT WIND: Yes.
THE COURT: When and for what purpose?
DEFENDANT WIND: I went there on May 22nd to go over the fence.
*566THE COURT: Did you go over the fence on May 22nd?
DEFENDANT WIND: Yes, I did.
THE COURT: Were you convicted of that charge?
DEFENDANT WIND: No. The charges were dismissed.
THE COURT: All right. Have you ever been arrested prior to that time?
DEFENDANT WIND: No.
THE COURT: Before I pronounce sentence, is there anything that you’d like to say with respect to the charges against you?
DEFENDANT WIND: Yes.
THE COURT: All right.
DEFENDANT WIND: When I went over the fence I was carrying this poem in my heart. It’s called “A Mountain Woman’s Dream.”:
(Poem read by Defendant Wind.)
THE COURT: Anything further to state to the Court.
DEFENDANT WIND: No.