What’s more, if you’re carrying an armload of hammers, every problem looks like a nail. The truth is that military power often isn’t very effective at solving modern problems, like a nuclear North Korea or an Iran that is on the nuclear path. Indeed, in an age of nationalism, our military force is often counterproductive.

After the first gulf war, the United States retained bases in Saudi Arabia on the assumption that they would enhance American security. Instead, they appear to have provoked fundamentalists like Osama bin Laden into attacking the U.S. In other words, hugely expensive bases undermined American security (and we later closed them anyway). Wouldn’t our money have been better spent helping American kids get a college education?

Paradoxically, it’s often people with experience in the military who lead the way in warning against overinvestment in arms. It was President Dwight Eisenhower who gave the strongest warning: “Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed.” And in the Obama administration, it is Defense Secretary Robert Gates who has argued that military spending on things large and small can and should expect closer, harsher scrutiny; it is Secretary Gates who has argued most eloquently for more investment in diplomacy and development aid.

American troops in Afghanistan are among the strongest advocates of investing more in schools there because they see firsthand that education fights extremism far more effectively than bombs. And here’s the trade-off: For the cost of one American soldier in Afghanistan for one year, you could build about 20 schools.

There are a few signs of hope in the air. The Simpson-Bowles deficit commission proposes cutting money for armaments, along with other spending. Secretary of State Hillary Clinton unveiled a signature project, the quadrennial diplomacy and development review, which calls for more emphasis on aid and diplomacy in foreign policy.

“Leading through civilian power saves lives and money,” Mrs. Clinton noted, and she’s exactly right. The review is a great document, but we’ll see if it can be implemented — especially because House Republicans are proposing cuts in the State Department budget.