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Obama would prove to be one of the most militarily aggressive American presidents in decades. He authorized military operations in seven Muslim countries—Afghanistan, Iraq, Libya, Pakistan, Somalia, Syria, and Yemen; mandated a troop surge in Afghanistan; and vastly ramped up the CIA drone program. And he became the first president since the Civil War to authorize the assassination of a U.S. citizen: Anwar al-Awlaki.
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Peter L. Bergen (United States of Jihad: Who Are America's Homegrown Terrorists, and How Do We Stop Them?)