We only drafted a small portion of the working age, male population compared to other countries. The vast majority of working-age men were still in the workforce. Less than 1/5th of those registered were conscripted, the target rate of the War Manpower Commission.
Furthermore Executive Order 9279 closed voluntary enlistment for working age men aged 18-38 to prevent factory labor shortages:
>After the effective date of this Order no male person who has attained the eighteenth anniversary and has not attained the thirty-eighth anniversary of the day of his birth shall be inducted into the enlisted personnel of the armed forces
Furthermore Executive Order 9279 closed voluntary enlistment for working age men aged 18-38 to prevent factory labor shortages:
>After the effective date of this Order no male person who has attained the eighteenth anniversary and has not attained the thirty-eighth anniversary of the day of his birth shall be inducted into the enlisted personnel of the armed forces