The AN/APR-2 was almost dropped from development. It used techniques that were so advanced that moving the receiver from the development stage to production became extremely problematic. There was a joke circulating among the product engineers that it should be dropped by parachute into Japan, and the resultant effort by the Japanese to get it to work would divert a significant portion of their war effort, thus providing more benefit to the Allies than actually productizing the set. In the end, they were successful in producing a maintainable receiver, and it was used well into the 1950s because of its unique characteristics of unmanned rapid broadband scanning and recording interceptions on paper tape.

AN/APR-2 Front Panel