The United States has formally protested Qatar's refusal to hand over U.S.-made Stinger missiles the Arab nation bought on the black market. A State Department official said Monday that Assistant Secretary Richard W. Murphy raised the issue with the defense minister of Qatar last weekend at a meeting in the Persian Gulf sheikdom's capital of Doha. Murphy, the assistant secretary of state for Near Eastern and South Asian Affairs, demanded the Stingers be returned to the United States, said the official, who spoke on condition of anonymity. "They have them. They got them from some place and we want them back," the official said.