Only a few hundred American troops are policing the southern border of one of Afghanistan's major smuggling areas, leaving open a vast expanse of desert that the Taliban use to shuttle in weapons and fighters from Pakistan.
This dusty hamlet 75 miles (120 kilometers) north of the border in Helmand province was the Taliban's key transit point from Pakistan before the Marines arrived in July. Since then, the Marines have set up a series of patrol bases east and west of Khan Neshin to disrupt the Taliban's supply lines.
But the battalion deployed at only about 50 per cent of its authorized strength, and one of its three companies is posted in central Helmand. That leaves several hundred Marines to cover roughly 6,000 square miles (15,000 square kilometers) - an area larger than Connecticut.
As a result, the Marines may have trouble curbing Taliban supply lines as thousands of fresh troops pour into the province as part of US President Barack Obama's surge.
"I would like to push closer to the border, but I can only go as far as I can support," said Lt. Col. Michael Martin, commanding officer of 4th Marine Division, 4th Light Armored Reconnaissance Battalion.
"Like Napoleon, you don't want to overextend your capabilities, or you will get your butt handed to you," said Martin, whose troops are spread out among a handful of patrol bases along the Helmand River, marking the coalition's most southern presence in the province.