The deferments will assuredly be somewhat different than they were 30-35 years ago, these are the ones currently posted by the U.S. Gov. but as you know, they can be changed at any time
Classifications
Men are not classified now. Classification is the process of determining who is available for military service and who is deferred or exempted. Classifications are based on each individual registrant's circumstances and beliefs. A classification program would go into effect when Congress and the President decide to resume a draft. Then, men who are qualified for induction would have the opportunity to file a claim for exemptions, deferments, and postponements from military service. Here is a list of some, though not all, classifications and what they mean:
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.
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.
Student Postponements - a college student may have his induction postponed until he finishes the current semester or, if a senior, the end of the academic year. A high school student may have his induction postponed until he graduates or until he reaches age 20. Appealing a Classification - A man may appeal his classification to a Selective Service Appeal Board.