Oct 29,  · Electronic warfare (EW), as defined by the Department of Defense (DOD), are military activities that use electromagnetic energy to control the electromagnetic spectrum . EW is the art and science of denying an enemy the benefits of the electromagnetic spectrum while pre-serving them for friendly forces. θ1 & θ2 are orthogonal 3 dB beamwidths in degrees. . Electronic warfare in the US Army remained dormant until when the need for trained EW personnel and equipment became apparent as ra