In many nations just making the transition to independence, the military is an important factor which can "either support democracy or subvert it."

It is our duty, Perry said, to teach other nations' military leaders the American style of military leadership, though it might seem counter-intuitive to share our knowledge with other armed forces.

"Openness is an unusual concept when it comes to defense," he said. "The art of war involves secrecy and surprise, while the art of peace involves honesty and trust."

Nevertheless, Perry added, building such trust with other nations requires a willingness on our part to demonstrate good faith.

Most important to the success of "preventive defense," Perry said, is the enthusiasm of the American people.

Drawing an analogy to the Marshall Plan, which was unveiled at Harvard's 1947 Commencement, Perry said Marshall's proposal succeeded because he "spent the next year going to the public."

To support "preventive defense," Perry said, a similar campaign must be undertaken today.

"The American people are, by nature, an impatient people and look for quick fixes," he said. "There are no quick fixes in international politics, and we have to convince the American people that preventive defense is good.