Curt Gilroy, the Pentagon's director of accessions, said the United States has "an obesity crisis."
"There's no question about it," Gilroy told the Navy Times. "Kids are just not able to do push-ups, and they can't do pull-ups. And they can't run."
The Pentagon figures -- 35 percent of the roughly 31.2 million Americans ages 17-24 are ineligible for military service -- are drawn from data from the Centers for Disease Control. In a study scheduled to be released Thursday in Washington, U.S. Secretary of Education Arne Duncan and a group of retired military officers say young Americans' lack of overall fitness for military duty is a national security threat, the Navy Times reported.
The report, drawing on Pentagon data, says almost three out of four 17- to 24-year-olds are ineligible for service for a variety of reasons including:
-- 35 percent ineligible for medical/physical problems.
-- 18 percent ineligible for illegal drug use.
-- 9 percent ineligible for mental problems.
-- 6 percent have too many dependents.
-- 5 percent have a criminal record.
2014: The Year in Music [PHOTOS]