During the Cuban Missile Crisis of 1962, the National Security Agency (NSA) of the USA realized that it was capable of reading transmissions emitted by SRO-2 identification friend or foe (IFF) transponders carried by Soviet-made combat aircraft airborne over Cuba.
After several years of development work, the resulting technology was installed in the form of the QRC-248 enemy IFF-interrogator system into Lockheed EC-121 Warning Star airborne...
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