iff

I am interested about the technical aspect and factual information on the Mark X IFF triangulation and spoofing during the Cold War. The source Who Goes There: Friend or Foe? on p. 61 claims that: Did the NVA trigger the responses from the US aircraft IFF systems and then triangulate them?

Early US jets used the AN/APX-6 IFF "transpondor," which employed the 'security through obscurity,' and which was equipped, just like its WW II predecessors, with three explosive charges to destroy its crucial assemblies to conceal the operational frequency should the equipment fall into enemy's...