Station HYPO

Celebrating the Past, Present and Future of Navy Cryptology


April 2021

QUIC Vans (Guest Post)

At the onset of the Cold War few USN ships had built-in cryptologic capability.  Although the Navy’s cryptologic efforts contributed significantly to the successful conclusion of World War II, SIGINT remained a highly secret business, conducted for the most part from shore locations throughout the world. 

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Operation Praying Mantis

On April 18, 1988, the U.S. Navy launched Operation Praying Mantis against Iranian targets in the Arabian Gulf in retaliation for USS Samuel B. Roberts (FFG 58) mining four days earlier, which blew an immense hole in the ship’s hull.

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Remembering Captain Karl B. Kohler, USN, (1610/Cryptologist)

Captain Karl Bernard Kohler, 1610, USN
April 18, 1916 – July 26, 2000

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PIRAZ in the Gulf of Tonkin – NSG’s Role (Guest Post)

PIRAZ (Positive Identification Radar Advisory Zone), more commonly known by the callsign “RED CROWN,” was the most important station given to ships of the Cruiser/Destroyer force and was responsible for control of Navy airstrikes against North Vietnam.  RED CROWN frequently controlled Air Force strike packages as well, and many USAF pilots preferred working with RED CROWN, a testament to the professionalism of whatever ship was assigned such duties. 

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USS Roper (DD 147) and German U-85 Submarine

April 15, 1942, USS Roper (DD 147) sank U-85 which was carrying the yet to be cracked 4-wheel Enigma machine. The Enigma was recovered from the wreck but a bit too late to help the war effort – it was found and illegally removed by recreational divers in 2001.

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Remembering Deep Sea 129 and her Crew

15 April 1969: This was a national holiday in the Democratic People’s Republic of Korea (North Korea), celebrating the 57th birthday of Kim Il-Sung, who had been the political leader of the communist country since 1948.

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