One week after a U.S. military airstrike killed a 16-year-old American citizen in Yemen, no one in the Obama administration, Pentagon or Congress has taken responsibility for his death, or even publicly acknowledged that it happened. The absence of official accountability for the demise of Abdulrahman al-Awlaki, a Denver native and the son of [Anwar al-Awlaki], deepens the legal and ethical murkiness of the Obama administration's campaign to kill alleged enemies of the state outside of traditional war zones. Officials throughout the U.S. government ... have refused to answer questions for the record about how or why Awlaki was killed Oct. 14 in a remote part of Yemen, along with eight other people. The official silence about the death of the American teenager contrasts with the Obama administration's eagerness to trumpet another airstrike in Yemen two weeks earlier. In that case, armed drones controlled by the CIA killed the teen's father, Anwar al-Awlaki. [A] U.S. official said the airstrike was launched by the military's secretive Joint Special Operations Command, or JSOC. The younger Awlaki was the third U.S. citizen killed by the U.S. government in Yemen in recent weeks.