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During the times of these conflicts I'm pretty sure the eligible ages to be drafted were from 18 - 25. During these times what percentage of US males between those ages were drafted. I'd like to be able to compare the number between WWII and Vietnam.

To put the question in perspective and dumb it down say (obviously false) during WWII the US at the time had 500,000 men between 18 - 25, 400,000 of which were drafted. So 80% of draft eligible males in the US at the time were drafted.

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This issue is made more complicated by the number of men in both conflicts who may have signed up in anticipation of the draft, with the intention of picking a less dangerous fate. – NL7 Apr 8 '14 at 18:21
Another thing to consider - does eligible only mean of draft age, or do you consider males with deferments or exemptions to be ineligible? – Comintern Apr 8 '14 at 23:23
up vote 6 down vote accepted

Wikipedia's page on conscription actually gives a pretty good breakdown.

In WWII, males between 18 and 64 were required to register, but the selections were limited by executive order on December 5, 1942 from from 21–45 to 18–38. Assuming the citation (George Q. Flynn, The Draft, 1940–1973) is correct, 50 million men from 18 to 45 were registered. The Selective Service statistics page gives the total inductions during WWII as 10,110,104, which would indicate that the percentage would be somewhere around 20% were drafted based on registration.

By the Vietnam war, the draft age had changed to 18-26 by the Selective Service Act. The draft pool was around 27 million (apparently lifted verbatim from a paragraph from this paper), and per the Selective Service page linked above, there were 1,857,304 inductions during Vietnam. Note that Morris gives the number as 2,215,000 - this may reflect a difference in start and end dates used but they are fairly close. This would indicate that roughly 7-9% of the draft pool was conscripted.

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