https://media.8ch.net/file_store/thumb/8e91a4a2758f2473cd4faff73a4fde2f310947254edb9ac947c0de18ece6752e.jpg
There was and danger close option for coastal invasion plans under IKE for a emp in the 1950's floated as a deterrent to soviet land aggression in European NATO ops and coastal U.S. for China and Russia. Likewise they had aerial op plans to emp three zones above the U.S. since the mid 1960's