High Quality Content by WIKIPEDIA articles! The EC-130H Compass Call is an American airborne tactical weapon system using a heavily modified version of the C-130 Hercules airframe. It is based at Davis-Monthan AFB. The system attempts to disrupt enemy command and control communications and limits adversary coordination essential for enemy force management. The Compass Call system employs the offensive counterinformation and electronic attack capabilities in support of U.S. and Coalition tactical air, surface, and special operations forces. Programmed upgrades will expand its mission by procuring a secondary Electronic Attack (EA) capability against early warning and acquisition radars.