In one village near Nawa, however, the atmosphere was tense.

"When we asked if they had a village elder or mullah for the American commander to talk to, the answer was no," said Capt. Drew Schoenmaker, a Marine company commander. "It's fear of reprisal. Fear and intimidation is one thing the enemy does very well."

Taking territory from the Taliban has always proved easier than holding it. The challenge is especially great in Helmand because it is a center of Afghanistan's thriving opium production, and drug profits feed both the insurgency and corrupt government officials.

On Wednesday, a British lieutenant colonel was killed in an explosion in Helmand. Lt. Col. Rupert Thorneloe, commander of the 1st Battalion Welsh Guards, was the highest-ranking British officer killed in Afghanistan.

A Canadian soldier, 30-year-old Cpl. Nicholas Bulger, was killed Friday in Kandahar province when his vehicle struck an improvised explosive device, the Canadian military said. Five other soldiers were hurt.

The missile attacks in Pakistan on Friday occurred about 620 miles east of Helmand in the rugged South Waziristan region, according to two officials who spoke on condition of anonymity because they were not authorized to release the information.

The area is a Taliban stronghold close to the Afghan border where Pakistani troops are gearing up for a major offensive.

Two missiles struck an abandoned seminary in the village of Mantoi used as a training base by militants from Pakistani Taliban leader Baitullah Mehsud's group, the officials said. In the other strike, one missile hit an insurgent communications center in the nearby village of Kokat Khel, they said.

In total, 17 people were killed and 27 others were wounded, they said.

However, Maulvi Noor Syed, an aide to Mehsud, told The Associated Press that only three Taliban fighters died in the strikes.

Also Friday, U.S. troops continued looking for an American soldier believed captured by insurgents, Navy Chief Petty Officer Brian Naranjo said. The soldier and three Afghans with him went missing on Tuesday in the eastern Paktika province

There was no immediate public claim of responsibility from any insurgent group. Much of the area is controlled by the Taliban faction led by Sirajuddin Haqqani, whom the U.S. has accused of masterminding beheadings and suicide bombings including the July 2008 attack on the Indian Embassy in Kabul that killed some 60 people.

Also Friday, Russia announced that it will allow the U.S. to ship weapons across its territory to Afghanistan, providing Washington an alternative route to supply its forces in the landlocked country.

Up until now, Russia has allowed the U.S. to ship non-lethal supplies across its territory for operations in Afghanistan, and Kremlin officials had suggested further cooperation was likely.