(CNN) — Childhood obesity isn’t just a health issue, according to a group of retired military leaders. It’s also a national security issue.

One in four young adults are too overweight to join the U.S. military, a new report from the advocacy group Mission: Readiness says. And the U.S. Department of Defense spends an estimated $1 billion each year on medical care related to obesity issues for active duty members, their dependents and veterans.

“No other major country’s military forces face the challenges of weight gain confronting America’s armed forces,” according to the report.

“At the end of the day, the reason America is safe and sound is not because of its tanks,” adds retired Lt. Gen. Norman Seip, spokesman for Mission: Readiness. “It’s really the men and women who volunteer and so proudly serve.”

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