It all started at Baledogle, the old Soviet airport 70 miles northwest of Mogadishu, Somalia's capital, where the U.S. runs a deeply clandestine drone operation with around 30 to 40 American personnel. While shrouded in secrecy, Baledogle has reportedly grown over the years into a key point for training Somali commandos and, early last month, for launching a joint strike against al-Shabab. The radical Islamist group grew out of the splintered factions of Sharia-based courts that filled the vacuum of authority after a U.S.-led coalition withdrew from the country in the early 90s. Today, al-Shabab sees itself as the preeminent terror force in Somalia with global ambitions. "These folks are honing their skills in a local conflict that is part of a global war they are waging against the United States," said Katherine Zimmerman, an expert on Al Qaeda at the American Enterprise Institute. Al-Shabab regularly attacks foreigners, including aid workers and Somalis, as it wages an insurgent fight against the U.S.-leaning government.