Over the past four years the United States has made at least 75 drone strikes in Yemen, killing at least 600 people. The al-Qaeda network in Yemen, according to the U.S., is the most dangerous terrorist organization in the world. It has grown from 300 members in 2009 to well over 1,000 today, despite all the killings. The drone strategy doesn’t work in Yemen the way it has in Afghanistan or Pakistan. In Yemen the terrorists are Yemeni, not outsiders. When terrorists in Yemen are killed by a drone, other Yemeni will defend them because of their sense of kinship, not because of shared ideology (Foreign Policy, August 6).