Veterans Day: America's wartime vets, by the numbers

A look at the number of Americans who have served in our nation's military since the end of World War I.

4. World War II

Hugh Gentry/Reuters/File
In this 2010 file photo, visitors enter the USS Arizona memorial at the World War II Valor in the Pacific National Monument at Pearl Harbor in Honolulu, Hawaii.

World War II(1941-45): America's most massive mobilization involved 16 million men and women, of whom 2.1 million are still alive.

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