The EC-130H Compass Call is an electronic attack aircraft flown by the United States Air Force. Based on the Lockheed Martin C-130 Hercules, the aircraft is heavily modified to disrupt enemy command and control communications, perform offensive counterinformation operations, and do other kinds of electronic attack. Planned upgrades will add the ability to attack early warning and acquisition radars.[1] Based at Davis-Monthan AFB in Arizona, EC-130Hs can be deployed worldwide at short notice to support U.S. and allied tactical air, surface, and special operations forces.