The US had tested the rail-gun sine 2008. Rial + Gun is rail gun. It initiated by Nazis Germany for fast attack conception. Its speed is about 3000m/s compared to 600m/second of the anti-aircraft missile. The combat aircraft at battlefield is around 200m/second. The railgun can be used for all any field as air defense, space defense, sea defense and even a ground defense objective. The US will use such gun for counter threat from China and Russia. This is time for real electronic warfare.