 US Department of Defense armed drones, which also sometimes take part in strikes on terrorist targets, are flown by US Air Force pilots located at Creech Air Force Base and Holloman Air Force Base.The CIA drones are operated by an office called the Pakistan-Afghanistan Department, which operates under the CIA's Counterterrorism Center (CTC), based at CIA's headquarters in Langley, Virginia.As of September 2011, the CTC had about 2,000 people on staff.