Staff Sgt. Lucas C. Trammell has had four tours in Iraq. He said what was most important to him was that he had not lost a soldier in his squad. Joao Silva for The New York Times

“A lot of people at home are tired of this,” said Staff Sgt. Trevino D. Lewis, sitting outside a gym at Camp Liberty, the dusty rubble-strewn base near Baghdad’s airport and coming to a point many soldiers made. The people back home can tune out; they cannot.

“The way I look at it, it’s my job,” he said, recounting and dismissing the shifting rationales for the war, from the weapons of mass destruction that did not exist to the overthrow of Saddam Hussein to the establishment of democracy in the Arab world. “It’s my career.”

The sense of duty among those who serve here, still strong, is nonetheless tempered by the fact that the war is winding down slowly — or, as one officer put it, petering out — with mixed results.

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