assistance center in Islamabad and coordinate military relief efforts. Lt. Gen. Karl Eikenberry, commander of U.S. forces in neighboring Afghanistan, visited Islamabad to oversee the initial U.S. military-assistance response but was returning to Kabul to resume his responsibilities in Afghanistan, U.S. Central Command said. The United States also would try to get trucks and bulldozers into Pakistan to help, Di Rita said. He said that because Pakistan's airports are so busy after the quake, the United States was operating some of its aircraft out of Bagram air base in Afghanistan. State Department deputy spokesman Adam Ereli said the government aid agency, USAID, had delivered plastic sheeting, blankets and water containers for up to 2,500 families and a team in Pakistan would assess needs for more aid. Rumsfeld and the U.S. officials -- speaking to reporters en route to Miami for a meeting of Central American security leaders -- also said the United States was sending six more helicopters and other military support to flood-stricken Guatemala. More than 1,000 people have died after Hurricane Stan swept through Central America and southern Mexico with flooding and mudslides. Pentagon officials said the number of U.S. helicopters in Guatemala would rise to 15 in coming days and would probably go higher.