KATHERINE HOURELD PRESIDENT Donald Trump's decision to pull U.S. troops out of Somalia in the waning days of his presidency has triggered dismay from some Somalis, who appealed to the incoming U.S. president to reverse the decision. "The U.S. decision to pull troops out of Somalia at this critical stage in the successful fight against al-Shabaab and their global terrorist network is extremely regrettable," Senator Ayub Ismail Yusuf told Reuters in a statement, referring to the al Qaida-linked al Shabaab insurgency. "U.S. troops have made a huge contribution and had great impact on the training and operational effectiveness of Somali…