The Drone Papers is a leak of national security documents published by The Intercept in October 2015 on the United States's use of drone warfare. The leak revealed the bureaucratic process of approving a drone strike.
Response
Micah Zenko of Foreign Policy wrote that the Drone Papers "mandate a Congressional investigation" that he did not expect to happen during the Obama administration. The Guardian wrote that the documents showed that close to 90 percent of United States drone killings in a five-month period did not kill the intended target.
References
Drone Papers Wikipedia(Text) CC BY-SA