Why do we need more troops in Afghanistan? This piece in the Washington Post over the weekend by Rajiv Chandrasekaran illustrates the problem quite clearly:

KANDAHAR AIR FIELD, Afghanistan
Sitting in an air-conditioned office within this gargantuan NATO encampment in southern Afghanistan, a U.S. officer pointed to a map of Kandahar province that indicated, with small, rectangular boxes, where soldiers deployed by President Obama earlier this year were now operating.
There were two battalions to the north of Kandahar city. Another to the far south. Canadian forces were going to swing to the west. About 5,000 new U.S. troops in all.
“But there, there and there,” the officer said, pointing to towns just outside a belt where the Americans and Canadians were stationed, “and there,” putting his fist on the city, which with 800,000 residents is the country’s second-largest population center, “we don’t have anyone.”
If more forces are not forthcoming to mount counterinsurgency operations in those parts of the province, he concluded, the overall U.S. effort to stabilize Kandahar — and by extension, the rest of Afghanistan — will fail.
“We might as well pack our bags and go home . . . and just keep a few Predators flying overhead to whack the al-Qaeda guys who return,” he said, speaking on the condition of anonymity because of the sensitivity of the issue. “There’s no point in doing half-measures here.”

Also, recent pieces worth reading by Max Boot here and Bruce Riedel and Michael O’Hanlon here.