Yemen: Obama Secret War

U.S. military teams and intelligence agencies are deeply involved in secret joint operations with Yemeni troops who in the past six weeks have killed scores of people, among them six of 15 top leaders of a regional al-Qaeda affiliate, according to senior administration officials.

The operations, approved by President Obama and begun six weeks ago, involve several dozen troops from the U.S. military's clandestine Joint Special Operations Command (JSOC), whose main mission is tracking and killing suspected terrorists.
The Washington Post