The Military Reporters & Editors website is pointing to a release by Missionreadiness.org, which says:
According to an alarming new report, 75 percent of young people ages 17 to 24 are unable to enlist in the military because they fail to graduate high school, have a criminal record, or are physically unfit. U.S. Secretary of Education Arne Duncan and some of America’s top retired military brass will hold a news conference at the National Press Club Thursday to call for immediate action to address this national security threat.