How often do we know who our drone strikes are killing?

NBC News reports (via):

The CIA did not always know who it was targeting and killing in drone strikes in Pakistan over a 14-month period, an NBC News review of classified intelligence reports shows.

About one of every four of those killed by drones in Pakistan between Sept. 3, 2010, and Oct. 30, 2011, were classified as "other militants,” the documents detail. The “other militants” label was used when the CIA could not determine the affiliation of those killed, prompting questions about how the agency could conclude they were a threat to U.S. national security.

The uncertainty appears to arise from the use of so-called “signature” strikes to eliminate suspected terrorists -- picking targets based in part on their behavior and associates. A former White House official said the U.S. sometimes executes people based on “circumstantial evidence.”

Three former senior Obama administration officials also told NBC News that some White House officials were worried that the CIA had painted too rosy a picture of its success and likely ignored or missed mistakes when tallying death totals.

NBC News has reviewed two sets of classified documents that describe 114 drone strikes over 14 months in Pakistan and Afghanistan, starting in September 2010. The documents list locations, death and injury tolls, alleged terrorist affiliations, and whether the killed and injured were deemed combatants or non-combatants.

Though the Obama administration has previously said it targets al Qaeda leaders and senior Taliban officials plotting attacks against the U.S. and U.S. troops, officials are sometimes unsure of the targets’ affiliations. About half of the targets in the documents are described as al Qaeda. But in 26 of the attacks, accounting for about a quarter of the fatalities, those killed are described only as “other militants.” In four others, the dead are described as “foreign fighters.”

In some cases, U.S. officials also seem unsure how many people died. One entry says that a drone attack killed seven to 10 people, while another says that an attack killed 20 to 22.

Yet officials seem certain that however many people died, and whoever they were, none of them were non-combatants. In fact, of the approximately 600 people listed as killed in the documents, only one is described as a civilian. The individual was identified to NBC News as the wife or girlfriend of an al Qaeda leader.

Micah Zenko, a former State Department policy advisor who is now a drone expert at the Council on Foreign Relations, said it was “incredible” to state that only one non-combatant was killed. “It’s just not believable,” he said. “Anyone who knows anything about how airpower is used and deployed, civilians die, and individuals who are engaged in the operations know this.” ...

Once a target has been killed, according to current and former U.S. officials, the CIA does not take someone out of the combatant category and put them in the non-combatant category unless, after the strike, a preponderance of evidence is produced showing the person killed was a civilian.