Daily Ancestor1-A
1-A (written I-A in World War II) was the draft classification for a registrant available for military service, the group called first.
Local boards sorted every registrant into a class. In World War I, Class I meant eligible and liable for service, mostly single men or married men whose families had other support; the lower classes were deferred or exempt. In World War II the top class was written I-A, with related codes such as I-A-O for objectors available for noncombatant duty and I-C for men already in the armed forces.
A World War II classification history can show a man moving between classes as his job, family or health changed, with the date the board mailed each classification notice.
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Daily Ancestor. "1-A." Dictionary of Old Record Words. https://dailyancestor.com/dictionary/military/class-1-a. Last checked 2026-10-12.