Can't electromagnetic force field technology be used to bring down aircrafts or make them lose their bearings?

Yes an electromagnetic pulse can be ruinous to any aircraft.For a good demonstration watch the James Bond movie Golden Eye.There is no relation to radioactive isotopes.It is doubtful the insurgents in Afghanistan have the sophisticated equipment necessary to produce electromagnetic pulses or force fields.Airplanes and helicopters are fragile craft and require both regular and thorough maintenance.They are probably not getting it in the combat conditions of Afghanistan which would explain the many crashes.