delivered the opinion of the Court.

Petitioner was indicted for willfully and knowingly failing to report for and submit to induction into the[*187] Armed Forces of the United States.^[1] At trial, petitioner’s only defense was that he should have been exempt from military service because he was the “sole surviving son” of a family whose father had been killed in action while serving in the Armed Forces of the United States.^[2] The District Court held that he could not raise that defense because he had failed to exhaust the administrative remedies provided by the Selective Service System. Accordingly, petitioner was convicted and sentenced to three years’ imprisonment. The Court of Appeals affirmed, with one judge dissenting. United States v. McKart, 395 F. 2d 906 (C. A. 6th Cir. 1968). We granted certiorari. 393 U. S. 922 (1968).

I.

The facts are not in dispute. Petitioner registered with his local Selective Service board shortly after his 18th birthday and thereafter completed his classification[*188] questionnaire. On that form he indicated that he was "the sole surviving son of a family of which one or more sons or daughters were killed in action . . . while serving in the Armed Forces of the United States . . . .” On February 25, 1963, petitioner's local board placed him in Class I-A, available for military service; he made no attempt to appeal that classification.^[3]

On March 23, 1964, he was ordered to report for a pre-induction physical, but failed to do so. He was declared a delinquent and ordered to report for induction on May 11, 1964. He failed to report, but instead wrote a letter to his local board indicating that his moral beliefs prevented him from cooperating with the Selective Service System. The local board replied by sending petitioner the form for claiming conscientious objector status. The board also referred to petitioner's indication in his original questionnaire that he was a sole surviving son and requested further information on that subject.

On May 20, 1964, petitioner returned the blank form, stating that he did not wish to be a conscientious objector. In response to the board's request for information about his claim to be a sole surviving son, petitioner indicated that his father had been killed in World War II. The local board, after consulting the State Director, again wrote petitioner requesting more information about his father. Petitioner supplied some of the information. The local board forwarded this information to the State[*189] Director, who requested the local board to reopen petitioner’s classification.^[4] The board canceled his induction order and reclassified him IV-A, the appropriate classification for a registrant exempted as a sole surviving son. Petitioner remained in that classification until February 14, 1966.

Early in 1966, the local board learned of the death of petitioner’s mother. After checking with the State Director, the board returned petitioner to Class I-A. The board rested this decision on the theory that a IV-A classification became improper when petitioner’s “family unit” ceased to exist on the death of his mother. Petitioner was ordered to report for a pre-induction physical. He failed to report and was declared a delinquent and ordered to report for induction. He again failed to report and, after further investigation, his criminal prosecution followed.^[5]

II.

We think it clear that petitioner was exempt from military service as a sole surviving son. The sole surviving son exemption originated in the Selective Service Act of 1948, c. 625, § 6 (o), 62 Stat. 613. As originally enacted, that section provided exemption for the sole surviving son only “[w]here one or more sons or daughters of a family were killed in action . . . while[*190] serving in the armed forces of the United States.” In 1964, the section was amended to extend the exemption to sole surviving sons whose fathers were killed in action. 78 Stat. 296. The section now reads in relevant part as follows:

“[W]here the father or one or more sons or daughters of a family were killed in action or died in line of duty while serving in the Armed Forces . . . the sole surviving son of such family shall not be inducted for service . . ..” 50 U. S. C. App. § 456 (o).

There is no question that petitioner was entitled to an exemption before the death of his mother. The issue is whether her death, and the end of the immediate “family unit,” ended that exemption.

We have found no cases discussing this aspect of § 6 (o).^[6] The applicable Selective Service System Regulation, 32 CFR § 1622.40 (a) (10) (1969), merely repeats the language of the statute. The System’s administrative interpretations have not been uniform,^[7] although in the present case the National Director took the position that “inasmuch as there is no family, it is not believed that [petitioner] would qualify for sole surviving son status.” We must, therefore, decide what is essentially a question of first impression. Our examination of the language and legislative history of § 6 (o) indicates that the Selective Service System’s interpretation fails to effectuate fully the purposes Congress had in mind in providing the exemption.

[*191] The language of the statute provides only three conditions, two explicit and one implicit, upon which the exemption should terminate. The registrant may volunteer for service, a national emergency or war may be declared, or, implicitly, the registrant may cease to be the sole surviving son by the birth of a brother. The section says nothing about the continuing existence of a family unit, even though other provisions of the Selective Service laws make similar conditions explicit in other contexts.^[8]

The argument for conditioning the exemption upon the continued existence of a family unit is based not upon the language or structure of the statute but upon certain references in the legislative history. These comments indicate that one purpose of the exemption was to provide ‘'solace and consolation” to the remaining family members by guaranteeing the presence of the sole surviving son. See S. Rep. No. 1119, 88th Cong., 2d Sess., 3 (1964); Hearings before Subcommittee No. 1 of the House Committee on Armed Services on H. R. 2664, 88th Cong., 1st Sess., 3442-3443 (1963). When there is no one left to comfort, it is argued, the sole surviving son may be drafted. However, our examination of the sparse legislative history discloses that Congress[*192] had not one but several purposes in mind in providing the exemption, only some of which depend upon the existence of a family unit.

Perhaps chief among these other purposes was a desire to avoid extinguishing the male line of a family through the death in action of the only surviving son. See S. Rep. No. 1119, supra; Hearing before the Senate Committee on Armed Services on H. R. 2664, 88th Cong., 1st Sess., 30-31 (1963); 110 Cong. Rec. 15218 (1964) (remarks of Senator Keating). Other purposes mentioned were providing financial support for the remaining family members, fairness to the registrant who has lost his father in the service of his country, and the feeling that there is, under normal circumstances, a limit to the sacrifice that one family must make in the service of the country. See Hearing before the Senate Committee on Armed Services on H. R. 2664, supra, at 30-31; Hearings before Subcommittee No. 1 of the House Committee on Armed Services on H. R. 2664, supra, at 3442-3443; 109 Cong. Rec. 24889 (1963).

Perhaps the most that can be said in these circumstances is that Congress had multiple purposes in mind in providing an exemption for a sole surviving son. Depriving petitioner of an exemption might not frustrate one of these purposes, but it certainly would frustrate several of the others. Therefore, given the beneficent basis for § 6 (o), we cannot believe that Congress intended to make one factor, the existence of a “family unit,” crucial. Accordingly, the death of petitioner’s mother did not operate to deprive him of his right to be exempt from military service. The local board erred in classifying petitioner I-A and ordering him to report for induction.

III.

The Government maintains, however, that petitioner cannot raise the invalidity of his I-A classification and[*193] subsequent induction order as a defense to a criminal prosecution for refusal to report for induction. According to the Government, petitioner’s failure to appeal his reclassification after the death of his mother constitutes a failure to exhaust available administrative remedies and therefore should bar all judicial review. For the reasons set out below, we cannot agree.

The doctrine of exhaustion of administrative remedies is well established in the jurisprudence of administrative law. See generally 3 K. Davis, Administrative Law Treatise § 20.01 et seq. (1958 ed., 1965 Supp.); L. Jaffe, Judicial Control of Administrative Action 424-458 (1965). The doctrine provides “that no one is entitled to judicial relief for a supposed or threatened injury until the prescribed administrative remedy has been exhausted.” Myers v. Bethlehem Shipbuilding Corp., 303 U. S. 41, 50-51 (1938). The doctrine is applied in a number of different situations and is, like most judicial doctrines, subject to numerous exceptions.^[9] Application of the. doctrine to specific cases requires an understanding of its purposes and of the particular administrative scheme involved.

Perhaps the most common application of the exhaustion doctrine is in cases where the relevant statute provides that certain administrative procedures shall be exclusive. See Myers v. Bethlehem Shipbuilding Corp., 303 U. S. 41 (1938) (National Labor Relations Act). The reasons for making such procedures exclusive, and for the judicial application of the exhaustion doctrine in cases where the statutory requirement of exclusivity is not so explicit, are not difficult to understand. A primary purpose is, of course, the avoidance of premature interruption of the administrative process. The agency, like[*194] a trial court, is created for the purpose of applying a statute in the first instance. Accordingly, it is normally desirable to let the agency develop the necessary factual background upon which decisions should be based. And since agency decisions are frequently of a discretionary nature or frequently require expertise, the agency should be given the first chance to exercise that discretion or to apply that expertise. And of course it is generally more efficient for the administrative process to go forward without interruption than it is to permit the parties to seek aid from the courts at various intermediate stages. The very same reasons lie behind judicial rules sharply limiting interlocutory appeals.

Closely related to the above reasons is a notion peculiar to administrative law. The administrative agency is created as a separate entity and invested with certain powers and duties. The courts ordinarily should not interfere with an agency until it has completed its action, or else has clearly exceeded its jurisdiction. As Professor Jaffe puts it, “[t]he exhaustion doctrine is, therefore, an expression of executive and administrative autonomy.” ^[10] This reason is particularly pertinent where the function of the agency and the particular decision sought to be reviewed involve exercise of discretionary powers granted the agency by Congress, or require application of special expertise.

Some of these reasons apply equally to cases like the present one, where the administrative process is at an end and a party seeks judicial review of a decision that was not appealed through the administrative process. Particularly, judicial review may be hindered by the failure of the litigant to allow the agency to make a factual record, or to exercise its discretion or apply its expertise. In addition, other justifications for requiring exhaustion in cases of this sort have nothing to do with the dangers[*195] of interruption of the administrative process. Certain very practical notions of judicial efficiency come into play as well. A complaining party may be successful in vindicating his rights in the administrative process. If he is required to pursue his administrative remedies, the courts may never have to intervene. And notions of administrative autonomy require that the agency be given a chance to discover and correct its own errors. Finally, it is possible that frequent and deliberate flouting of administrative processes could weaken the effectiveness of an agency by encouraging people to ignore its procedures.

In Selective Service cases, the exhaustion doctrine must be tailored to fit the peculiarities of the administrative system Congress has created. At the heart of the Selective Service System are the local boards, which are charged in the first instance with registering and classifying those subject to the Selective Service laws. 32 CFR § 1613.1 et seq., §§ 1621.1-1623.10 (1969). Upon being classified by the local board, the registrant has a right of appeal to a state appeal board, 32 CFR § 1626.2 (1969), and, in some instances, to the President, 32 CFR § 1627.3 (1969). No registrant is required to appeal.^[11] A registrant cannot be ordered to report for induction while his classification is being considered by the local board or by an appeal board. 32 CFR §§ 1624.3,1625.14, 1626.41, 1627.8 (1969).

At some stage during this process, normally shortly before he is expected to be ordered to report for induction, see 32 CFR § 1628.11 (1969), the registrant is required to complete a pre-induction physical examination. If he passes this examination, he ordinarily will be ordered to[*196] report for induction. The next, and last, step is to report to the induction center and submit to induction. At this point, the administrative process is at an end.

If the registrant fails to report for induction, he is, like petitioner in the present case, subject to criminal prosecution. Although the Universal Military Training and Service Act, as it stood at the time of petitioner’s trial, provided that the decisions of the local boards were “final,” it was long ago established that a registrant charged with failure to report can raise the defense that there was “no basis in fact” for his classification. See Estep v. United States, 327 U. S. 114, 123 (1946). It is also established that there can be no judicial review at all, with some exceptions, until the registrant has refused to submit to induction and is prosecuted, or else has submitted to induction and seeks release by habeas corpus.^[12]

This case raises a different question. We are not here faced with a premature resort to the courts — all admin[*197] istrative remedies are now closed to petitioner. We are asked instead to hold that petitioner’s failure to utilize a particular administrative process — an appeal — bars him from defending a criminal prosecution on grounds which could have been raised on that appeal. We cannot agree that application of the exhaustion doctrine would be proper in the circumstances of the present case.

First of all, it is well to remember that use of the exhaustion doctrine in criminal cases can be exceedingly harsh. The defendant is often stripped of his only defense; he must go to jail without having any judicial review of an assertedly invalid order. This deprivation of judicial review occurs not when the affected person is affirmatively asking for assistance from the courts but when the Government is attempting to impose criminal sanctions on him. Such a result should not be tolerated unless the interests underlying the exhaustion rule clearly outweigh the severe burden imposed upon the registrant if he is denied judicial review.^[13] The statute as it stood when petitioner was reclassified said nothing which would require registrants to raise all their claims before the appeal boards.^[14] We must ask, then, whether there is in this case a governmental interest compelling enough to outweigh the severe burden placed on petitioner. Even if there is no such compelling interest when petitioner’s case is viewed in isolation, we must also ask whether allowing all similarly situated registrants to bypass administrative appeal procedures would seriously impair the Selective Service System’s ability to perform its functions.

The question of whether petitioner is entitled to exemption as a sole surviving son is, as we have seen, solely[*198] one of statutory interpretation. The resolution of that issue does not require any particular expertise on the part of the appeal board; the proper interpretation is certainly not a matter of discretion.^[15] In this sense, the issue is different from many Selective Service classification questions which do involve expertise or the exercise of discretion, both by the local boards and the appeal boards.^[16] Petitioner’s failure to take his claim through all available administrative appeals only deprived the Selective Service System of the opportunity of having[*199] its appellate boards resolve a question of statutory interpretation. Since judicial review would not be significantly aided by an additional administrative decision of this sort, we cannot see any compelling reason why petitioner’s failure to appeal should bar his only defense to a criminal prosecution.^[17] There is simply no overwhelming need for the court to have the agency finally resolve this question in the first instance, at least not where the administrative process is at an end and the registrant is faced with criminal prosecution.^[18]

We are thus left with the Government’s argument that failure to require exhaustion in the present case will induce registrants to bypass available administrative remedies. The Government fears an increase in litigation and a consequent danger of thwarting the primary function of the Selective Service System, the rapid mobilization of manpower. This argument is based upon the proposition that the Selective Service System will, through its own processes, correct most errors and thus avoid much litigation. The exhaustion doctrine is assert-edly necessary to compel resort to these processes. The Government also speculates that many more registrants will risk criminal prosecution if their claims need not carry into court the stigma of denial not only by their local boards, but also by at least one appeal board.

We do not, however, take such a dire view of the likely consequences of today’s decision. At the outset, we[*200] doubt whether many registrants will be foolhardy enough to deny the Selective Service System the opportunity to correct its own errors by taking their chances with a criminal prosecution and a possibility of five years in jail. The very presence of the criminal sanction is sufficient to ensure that the great majority of registrants will exhaust all administrative remedies before deciding whether or not to continue the challenge to their classifications. And, today’s holding does not apply to every registrant who fails to take advantage of the administrative remedies provided by the Selective Service System. For, as we have said, many classifications require exercise of discretion or application of expertise; in these cases, it may be proper to require a registrant to carry his case through the administrative process before he comes into court. Moreover, we are not convinced that many in this rather small class of registrants will bypass the Selective Service System with the thought that their ultimate chances of success in the courts are enhanced thereby. In short, we simply do not. think that the exhaustion doctrine contributes significantly to the fairly low number of registrants who decide to subject themselves to criminal prosecution for failure to submit to induction. Accordingly, in the present case, where there appears no significant interest to be served in having the System decide the issue before it reaches the courts, we do not believe that petitioner’s failure to appeal his classification should foreclose all judicial review.

We do not view the cases of Falbo v. United States, 320 U. S. 549 (1944), and Estep v. United States, 327 U. S. 114 (1946), insofar as they concern the exhaustion doctrine, as a bar to today’s holding. Neither those two cases, nor any of the other cases decided by this Court,^[19] [*201] stand for the proposition that the; exhaustion doctrine must be applied blindly in every case. Indeed, those cases all involved ministerial or conscientious objector claims, claims that may well have to be pursued through the administrative procedures provided by the Selective Service laws.^[20]

IV.

Finally, we are faced with the argument that petitioner’s challenge to the validity of his classification is barred by his failure to report for and pass his pre-induction physical, thus giving the System one last chance to reject him. The Government points to the fact that large numbers of registrants are rejected for physical and mental reasons, and asserts that many criminal trials would be rendered unnecessary if registrants were required to report for a physical before being allowed to challenge their classifications.

We think there are several answers to this argument. First, as we said above, we doubt very much whether very many registrants would pass up the chance to escape service by reason of physical or mental defects and leap immediately at the chance to defend a criminal prosecution. But more importantly, a registrant is under a duty to comply with the order to report for a physical examination ^[21] and may be criminally prosecuted for failure to comply.^[22] If the Government deems it important enough to the smooth functioning of the System to have unfit, registrants weeded out at the earliest possible moment, it can enforce the duty to report for pre-induction examinations by criminal sanctions. In the present case, it has not chosen to do so. Petitioner has not been prosecuted for failure to report for his examination; he has been prosecuted for failure to report for induction, a duty[*202] he claims he did not have. Therefore, we hold that petitioner’s failure to report for his examination should not bar him from challenging the validity of his classification as a defense to his criminal prosecution.

We do not regard Falbo v. United States, supra, as a bar to this holding. Falbo involved an attempt to raise the invalidity of a registrant’s classification as a defense to a criminal prosecution for failure to report to a civilian work camp. The Court noted that the defendant had not reported to the work camp and thus had not given the Selective Service System the opportunity to reject him for physical or mental reasons. According to the Court, the “narrow question . . . presented . . . [was] whether Congress has authorized judicial review of the propriety of a board’s classification in a criminal prosecution for wilful violation of an order directing a registrant to report for the last step in the selective process.” 320 U. S., at 554. The Court held that Congress had not authorized such review.

Falbo was limited by Estep v. United States, supra, which held that a registrant could secure limited judicial review of his classification in a criminal prosecution for failure to report if he had pursued his administrative remedies to an end. In Estep, the registrant had reported, had been accepted for induction, but had refused to be inducted.

The holding of the Court in Falbo was based in part on a fear of litigious interruption of the Selective Service System. We have dealt with that problem in other cases. See Clark v. Gabriel, 393 U. S. 256 (1968); Oestereich v. Selective Service Board, 393 U. S. 233 (1968). It is not presented here. As noted above, the administrative process in this case is at an end.

Finally, the Court in Falbo was concerned with the possibility that a registrant might be rejected for physical or mental reasons, thus making a criminal prosecution[*203] unnecessary. But, as we have seen, the Selective Service System has ample means to ensure that the great majority of registrants will report for their pre-induction examinations. At the time Falbo was decided the regulations provided that the pre-induction examination was to be given at the time the registrant responded to the order to report for induction or to the work camp. See Gibson v. United States, 329 U. S. 338 (1946). Accordingly, the Selective Service System had no way to enforce the duty to report for an examination other than by a prosecution for failure to report for induction. An invalid classification, if allowed to be raised, would have been a complete defense to that prosecution; it would not be a defense today to a prosecution for failure to report for a pre-induction examination.

We hold that petitioner’s failure to appeal his classification and failure to report for his pre-induction physical do not bar a challenge to the validity of his classification as a defense to his criminal prosecution for refusal to submit to induction. We also hold that petitioner was entitled to exemption from military service as a sole surviving son. Accordingly, we reverse the judgment of the court below and remand the case for entry of a judgment of acquittal. T, . , , J ° It is so ordered.