John Anthony Walker Jr. served as a U.S. Navy communications specialist from 1955 until his retirement in 1976. His espionage began around 1967, driven primarily by financial need. He provided his KGB handlers with cryptographic key cards and manuals, allowing the Soviet Navy to decipher virtually all secure U.S. naval communications. After retiring, he maintained and expanded the ring by recruiting his brother Arthur, a retired Navy lieutenant commander, his friend Jerry Whitworth, a Navy radio

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