- 1-A - available immediately for military service.
- 1-O - Conscientious Objector- conscientiously opposed to both types (combatant and non-combatant) of military training and service - fulfills his service obligation as a civilian alternative service worker.
- 1-A-O - Conscientious Objector - conscientiously opposed to training and military service requiring the use of arms - fulfills his service obligation in a noncombatant position within the military.
Note: A registrant making a claim for Conscientious Objection is required to appear before his local board to explain his beliefs. The local board will decide whether to grant or deny a CO classification based on the evidence a registrant has presented. A man may appeal a Local Board's decision to a Selective Service District Appeal Board. If the Appeal Board also denies his claim, but the vote is not unanimous, he may further appeal the decision to the National Appeal Board.
- 2-D - Ministerial Students - deferred from military service.
- 3-A - Hardship Deferment - deferred from military service because service would cause hardship upon his family.
- 4-C - Alien or Dual National - sometimes exempt from military service.
- 4-D - Ministers of Religion - exempted from military service.
- 4-F - Not Qualified for Military Service due to medical reasons.
- I-A - Registrant available for military service.
- I-A-O - Conscientious objector registrant available for noncombatant military service only.
- I-C - Member of the Armed Forces of the US, the Environmental Science Services Administration, or the Public Health Service.
- I-D - Qualified member of reserve component, or student taking military training, including ROTC and accepted aviation cadet applicant.
- I-S - Student deferred by law until graduation from high school or attainment of age of 20, or until end of his academic year at a college or university.
- I-W - Conscientious objector performing civilian work contributing to the maintenance of national health, safety, or interest, or who has completed such work.
- I-Y - Registrant qualified for military service only in time of war or national emergency.
- II-A - Occupational deferment (other than agricultural and student).
- II-C - Agricultural deferment.
- II-S - Student deferment.
- III-A - Extreme hardship deferment, or registrant with a child.
- IV-A - Registrant with sufficient prior active service or who is a sole surviving son.
- IV-B - Official deferred by law.
- IV-C - Alien not currently liable for military service.
- IV-D - Minister of religion or divinity student.
- IV-F - Registrant not qualified for any military service.
- Class V-A - Registrant over the age of liability for military service.
A man may appeal his classification to a Selective Service Appeal Board.
Contrary to popular belief, "only sons," "the last son to carry the family name," and "sole surviving sons" must register and they can be drafted. However, they may be entitled to a peacetime deferment if there is a military death in the immediate family. More information about Sole Surviving Sons.
Much of the Above Information Courtesy of Selective Service