A man stands in a sewage-filled street in Fallujah in 2010. The Fallujah wastewater treatment system was left unfinished more than four years past the initial deadline. The sewage facility is among hundreds of projects funded by U.S. taxpayers that remain abandoned or incomplete, wasting more than $5 billion, according to auditors. Hadi Mizban/AP hide caption

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Darryl St. George, a Navy corpsman, walks along a mud compound wall in Helmand province, southern Afghanistan. Next month will mark 10 years for U.S. forces in Afghanistan. David Gilkey/NPR hide caption

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As Wars Drag On, U.S. Interest Wanes

There was huge public support for the U.S. war in Afghanistan when it began a decade ago. Today, only a quarter of Americans follow it closely.

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Richard Engel is NBC News' chief foreign correspondent. Dan Nelken/NBCU hide caption

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Army Pfc. Brayden Panttaja, 23, of Moscow, Idaho, walks past a pile of burning garbage while descending from a hilltop observation post at Combat Outpost Monti in Kunar province, Afghanistan, on Tuesday. David Goldman/AP hide caption

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Defense Secretary Leon Panetta is managing two wars in Afghanistan and Iraq, along with the fight against al-Qaida. Susan Walsh/AP hide caption

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Students play a basketball game on the campus of Iraq's Baghdad College, in this undated photograph. Ed Ou/The New York Times hide caption

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Neil Johnson, a University of Miami physicist, developed this mathematical formula to predict insurgent attacks in war zones. Courtesy of Neil Johnson hide caption

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