More Ground Troops To Be Used: The U.S. military is working to bring more ground troops into Afghanistan to act as liaisons with anti-Taliban elements and help with targeting, Defense Secretary Donald H. Rumsfeld said Thursday. Rumsfeld, who was scheduled to leave for a three-day trip to Russia and Central Asia on Friday, said for the first time Tuesday that a small number of U.S. troops are on the ground in Afghanistan, in particular to work with anti-Taliban forces such as the Northern Alliance. He expanded his comments Thursday to say the U.S. military has attempted to insert additional special operations teams into the country, but problems have forced commanders to abort some of the missions. "We have been working very diligently, for weeks" to bring special operations teams into Afghanistan, Rumsfeld said. But "the weather has been one problem" for more than one team.