How Effective Was Sept. 11 Response? As the fifth anniversary of the Sept.11 attacks nears, many people are wondering how effective the U.S.-led response has been in making another attack less likely.
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How Effective Was Sept. 11 Response?

Gunnery Sgt. Gregory Schaff, 43, mans a grenade machine gun in a Marine convoy in Afghanistan, during Operation Enduring Freedom, Dec. 3, 2001. U.S. Navy Photo by David C. Mercil/Getty Images hide caption

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U.S. Navy Photo by David C. Mercil/Getty Images

Gunnery Sgt. Gregory Schaff, 43, mans a grenade machine gun in a Marine convoy in Afghanistan, during Operation Enduring Freedom, Dec. 3, 2001.

U.S. Navy Photo by David C. Mercil/Getty Images