71 percent of young Americans between 17 and 24 are ineligible to serve in the military—that is 24 million of the 34 million people of that age group--due to lack of education, obesity, and other physical problems, or criminal history.
https://www.heritage.org/defense/re...sis-young-americans-unable-serve-the-military
A key indicator of interest in military service comes from the Pentagon’s "propensity" poll, in which officials ask young people ages 16 to 21 a basic question: "How likely is it that you will be serving in the military in the next few years?"
The percent who respond "probably" or "definitely" was recently pegged at 19 percent in the poll conducted last fall, the most recent data available. That’s not far from the peak of 23 percent in late 2003, when patriotic fervor surged following the Bush administration's decision to invade Iraq, and yet it's far removed the historic low of 12 percent, experienced in late 2007, when pessimism about the war and high casualties dragged down public perception of military service.
https://www.militarytimes.com/news/...eps-data-on-millennials-this-is-what-it-says/