FILE – In this Saturday, Jan. 24, 2015 file photo, protesters chant slogans against Houthi Shiite rebels who hold the capital, Sanna, amid a power vacuum as they march on a street in Sanaa. A U.S. drone strike targeting al-Qaida in Yemen signals Washingtons determination to keep fighting the militants despite political paralysis brought on by the minority Shiite power grab. But officials say an effective ground strategy to truly uproot the militants will have to await the emergence of a functioning local government that can act as an ally. (AP Photo/Hani Mohammed, File)