CIA drone attacks in Pakistan killed at least 581 militants last year, according to independent estimates. The number of those militants noteworthy enough to appear on a U.S. list of most-wanted terrorists: two.
Despite a major escalation in the number of unmanned Predator strikes being carried out under the Obama administration, data from government and independent sources indicate that the number of high-ranking militants being killed as a result has either slipped or barely increased.
Even more-generous counts - which indicate that the CIA killed as many as 13 "high-value targets" - suggest that the drone program is hitting senior operatives only a fraction of the time.
After a year in which the CIA carried out a record 118 drone strikes, costing more than $1 million apiece, the results have raised questions about the purpose and parameters of the drone campaign.
Senior Pakistani officials recently asked the Obama administration to put new restraints on a targeted-killing program that the government in Islamabad has secretly authorized for years.