QAMISHLI, Syria — U.S. forces are withdrawing from a key base in northeastern Syria, officials said Monday, in what appears to be part of a larger drawdown of U.S. forces in Syria . Iraqi and Syrian security officials said that the U.S. military had begun moving its forces and equipment from the Qasrak base in Syria to Iraq’s semi-autonomous Kurdish region. Associated Press journalists in the city of Qamishli in northeast Syria saw a convoy of dozens of trucks carrying military vehicles and