The 55th Electronic Combat Group, Davis-Monthan Air Force Base, provides combat-ready EC-130H Compass Call aircraft, crews, maintenance and operational support to combatant commanders. The group is a geographically separated unit (GSU) that falls under the command of the 55th Wing at Offutt AFB, NE. The group also plans and executes information operations, including information warfare and electronic attack, in support of theater campaign plans. Members of the 55 ECG conduct EC-130H aircrew initial qualification and difference training for 20 aircrew specialties and support operational and force development testing and evaluation for new aircraft systems.