See through walls divices in drones: Radio sounds to untrasound images : Visible and Invisible devices uses - wars only left out . One part availabe the other part which corrupt or jam signals or filer signals or split signal or join signals or signal boosters which mostly use in defence secrets trades about nations, business. For nations or rulers or opposition or public sectors or private sectora no more secrecy. Using unkown range signals in communications. Any thing money matters, just like governments and companies do need money to survive. Not many reasons or proffs needed for wars, users are indirect benificiaries are indirect. Fooling ideas may be forwarded after theft reagarding to stop wars. Many adults delibrately use prons in communication to irritate hackers and privacy intruders by moral policing. Allowing TV broadcasting, Radio bradcasting, FM, Live broadcasting, ISM, CDMA, still national security intelligence a hype !. In eneterainment industry high pay not unknown to many as indirect ray prons by ultrasound hidden uses.Same happen to many professipnals in public sectors too remain unknown.