The story of Radar in World War II is an interesting one. It was developed by the British, and then subsequently perfected by them. It was, essentially at the time, the perfect technology. It worked well, training of operators was relatively easy, and for the American Army and Navy: it was cheap. Britain had, in a desperate move to gain favor and production capability, transferred their entire folio of radar research and design information.
Radar was cheap, fast, and you could mash it in to existing process and workflow. Everything seemed rosy.