US Military Draft and Enlistment Age Requirements (1776–2026)
Historical timeline of federal draft and voluntary enlistment age limits across 17 eras from the Revolutionary War to the present.
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| # | Era | Year Start | Year End | Draft Active | Draft Age Min | Draft Age Max | Enlistment Age Min | Enlistment Age Max | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Pre-Civil War | 1,776 | 1862 | No | 18 | 45 | All-volunteer; state militia laws varied; no federal conscription | ||
| 2 | Civil War | 1,863 | 1865 | Yes | 20 | 45 | 18 | 45 | First federal draft; substitutes & paid exemptions ($300) allowed |
| 3 | Post-Civil War | 1,866 | 1916 | No | 18 | 40 | All-volunteer; no federal draft between wars | ||
| 4 | WWI (early) | 1,917 | 1917 | Yes | 21 | 30 | 18 | 40 | Selective Service Act of 1917; initial narrow age band |
| 5 | WWI (expanded) | 1,918 | 1918 | Yes | 18 | 45 | 18 | 40 | Age range expanded mid-war by Congress |
| 6 | Interwar period | 1,919 | 1939 | No | 18 | 35 | No draft; all-volunteer peacetime force | ||
| 7 | WWII (early) | 1,940 | 1941 | Yes | 21 | 36 | 18 | 35 | Burke-Wadsworth Act; first peacetime draft in US history |
| 8 | WWII (expanded) | 1,942 | 1946 | Yes | 18 | 45 | 17 | 45 | Pearl Harbor drove expansion; 17 with parental consent |
| 9 | Post-WWII gap | 1,947 | 1947 | No | 17 | 35 | Draft briefly lapsed; Selective Service Act expired | ||
| 10 | Cold War draft | 1,948 | 1949 | Yes | 18 | 26 | 17 | 35 | Selective Service Act of 1948 reinstated the draft |
| 11 | Korean War | 1,950 | 1953 | Yes | 18 | 26 | 17 | 35 | Active combat; ~472K inducted at peak in 1953 |
| 12 | Cold War (mid) | 1,954 | 1964 | Yes | 18 | 26 | 17 | 35 | Peacetime draft; college deferments widely used |
| 13 | Vietnam War | 1,965 | 1969 | Yes | 18 | 26 | 17 | 35 | Escalating inductions; peak ~340K in 1966 |
| 14 | Vietnam (lottery) | 1,970 | 1972 | Yes | 18 | 26 | 17 | 35 | Lottery system introduced Dec 1969 to reduce perceived inequity |
| 15 | Draft end | 1,973 | 1973 | Yes | 18 | 26 | 17 | 35 | Last inductions Jan 1973; all-volunteer force announced |
| 16 | All-volunteer era | 1,974 | 2003 | No | 17 | 35 | No conscription; Selective Service registration still required at 18 | ||
| 17 | Post-9/11 to now | 2,004 | 2026 | No | 17 | 42 | Max age raised by branch (Army 35, Navy 41, Coast Guard 42) |
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