4F was the reject class, 1A was you were on your way. When the Government started to classify people in 1941 they made a lot of people 4F in 1941. Come the troops shortage of 1944 the Army went through those list and "reviewed" them and made a lot of 4Fs to 1As. These ended up replacements on the line in Europe in late 1944 into 1945 and had a terrible survival record (as did most replacements on the line).
For more on the draft see:
http://www.sss.gov/classif.htmhttp://usmilitary.about.com/cs/wars/a/draft2_3.htm Draft Board Classifications
The following is a list of Selective Service classifications
that could be assigned by draft boards (This is a mix of both "Current" and "Historical" classification. Over the history of Selective Service the most of the classes have been constant but there have been some changes:
Classification
CLASS II-A Available for military service
I-A-0 Conscientious objector available for noncombatant military service only
I-C Member of the armed forces of the U.S., the Coast and Geodetic Survey, or the Public Health Service
I-D Member of reserve component or student taking military training
I-H Registrant not currently subject to processing for induction
I-0 Conscientious objector available for civilian work contributing to the maintenance of the national health, safety, or interest
I-S Student deferred by statute (High School)
1-SC. It meant that you had exactly six months to get your affairs in order before you would be drafted (Abolished during Vietnam with most student Deferments).
I-Y Registrant available for military service, but qualified for military only in the event of war or national emergency
I-W Conscientious objector performing civilian work contributing to the maintenance of the national health, safety, or interest
CLASS II - Exempt "Deferred" personalII-A Registrant deferred because of civilian occupation (except agriculture or activity in study)
II-C Registrant deferred because of agricultural occupation
II-D Registrant deferred because of study preparing for the ministry
II-S Registrant deferred because of activity in study
Class III - HardshipIII-A Registrant with a child or children; registrant deferred by reason of extreme hardship to dependents
Class IV - Not Subject to DraftIV-A Registrant who has completed service; sole surviving son
IV-B Official deferred by law
IV-C Alien
IV-D Minister of religion or divinity student
IV-F Registrant not qualified for any military service
IV-G Registrant exempt from service during peace (surviving son or brother)
IV-W Conscientious objector who has completed alternate service contributing to the maintenance of the national health, safety, or interest in lieu of induction into the Armed Forces of the United States
Class V - OtherV-A Registrant over the age of liability for military service (This was apparently used starting in WWII to provide men with a "Draft Card" to show they did not have to register. Remember Under the Selective Service Act EVERY male between 18 and 35 had to register AND CARRY THEIR DRAFT CARD WITH THEM. Non-possession of the Draft Card subjected you to arrest. If you were male and a Police Officer thought you were between age 18 and 35 the burden was on you to show you were OVER the age to be Drafted. A lot of people did NOT have driver's licenses OR birth Certificates or other ID prior to or during WWII, the Draft Card was one of the first Universal IDs and used as such till the Vietnam War. Thus this classification. Please Note when registration was renewed under Carter the law was changed and the Draft Card was abolished so men born after 1957 were NOT issued Draft Cards).