The Obama administration has portrayed drones as an effective and efficient weapon in the ongoing war with al Qaeda and other radical groups. Yet classified Pentagon documents obtained by The Intercept reveal that the U.S. military has faced "critical shortfalls" in the technology and intelligence it uses to find and kill suspected terrorists in Yemen and Somalia.

THOSE SHORTFALLS STEM from the remote geography of Yemen and Somalia and the limited American presence there. As a result, the U.S. military has been overly reliant on signals intelligence from computers and cellphones, and the quality of those intercepts has been limited by constraints on surveillance flights in the region.

The documents are part of a study by a Pentagon Task Force on Intelligence, Surveillance, and Reconnaissance. They provide details about how targets were tracked for lethal missions carried out by the Joint Special Operations Command, or JSOC, in Yemen and Somalia between January 2011 and summer 2012.