WASHINGTON — The nation’s security and economic prosperity are at risk if America’s schools don’t improve, warns a task force led by former Secretary of State Condoleezza Rice and Joel Klein, the former chancellor of New York City’s school system.

The report, obtained by The Associated Press, cautions that far too many schools fail to adequately prepare students. “The dominant power of the 21st century will depend on human capital,” it said. “The failure to produce that capital will undermine American security.”

The task force said the State Department and U.S. intelligence agencies face critical shortfalls in the number of foreign language speakers, and that fields such as science, defense and aerospace are at particular risk because a shortage of skilled workers is expected to worsen as baby boomers retire.

According to the panel, 75 percent of young adults don’t qualify to serve in the military because they are physically unfit, have criminal records or inadequate levels of education.

That’s in part because 1 in 4 students fails to graduate from high school in four years, and a high school diploma or the equivalent is needed to join the military. But another 30 percent of high school graduates don’t do well enough in math, science and English on an aptitude test to serve in the military, the report said.

The task force, consisting of 30 members with backgrounds in areas such as education and foreign affairs, was organized by the Council on Foreign Relations, a New York-based research and policy organization focused on international issues. The report was scheduled to be released today.

Too many Americans are deficient in both global awareness and knowledge that is “essential for understanding America’s allies and its adversaries,” the report concludes.

“Leaving large swaths of the population unprepared also threatens to divide Americans and undermines the country’s cohesion, confidence, and ability to serve as a global leader,” the report said.