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"On This Date in Cryptologic History" Calendar

Learn about a wide variety of historical events related to cryptology, computers, math, cybersecurity, Intelligence, and more.

March 2026

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S M T W T F S
Mar 1 2 3 4 5 6 7
1917: Zimmermann Telegram released to U.S. press.
1971: Cryptologic Pioneer Colonel Parker Hitt.
1832: Death of Jean-François Champollion.
1942: Station HYPO began reading Japanese system JN-25.
1924: William Friedman testifies re: Teapot Dome scandal.
1973: 509th Radio Research Group was resubordinated.
1918: German ADFGVX cipher first used.
1971: Army RU-8 shot down, Vietnam.
1946: BRUSA Communications Intelligence Agreement
1930: First hire at SIS - Annie Louise Newkirk
1975: STONEHOUSE site officially closed.
1951: Shelby Patterson became chief of the AFSA school.
1971: Loss of Army UH-1 & its crew.
8 9 10 11 12 13 14
1953: "Direct" SIGINT support to tactical air control center began on Cho Do Island.
1967: USAF EC-47 loss in Vietnam.
1876: First successful voice transmission over Bell's telephone.
1935: Navy cryptologic organization redesignated OP-20-G as Communications Security Group.
1951: AFSA Training Branch Established
1951: Seoul, South Korea, recaptured by UN forces.
1969: Death of Ralph J. Canine, first DIRNSA.
1918: Radio Intelligence Service, Mexican border, was established.
1942: Evacuation of Station CAST.
1954: USAFSS started Airborne Reconnaissance Program
15 16 17 18 19 20 21
1946: CREAM replaced ULTRA.
1974: Horst Feistel received a patent for "Block Cipher Cryptographic System."
1938: SIS started receiving messages from Purple.
1981: USAF RC-135 lost, Shemya.
2003: Operation Iraqi Freedom began.
22 23 24 25 26 27 28
1962: ASA flew first airborne radio direction finding mission in Vietnam.
1999: NATO began Operation ALLIED FORCE in Kosovo.
1999: Lt Gen Michael Hayden, USAF, became DIRNSA.
1994: Griffiss Air Force Base finds malware
29 30 Mar 31 Apr 1 2 3 4
Vietnam Veterans Day
1938: Chief Signal Officer Mauborgne permitted to perform intercept and cryptologic services for peacetime training.
1973: Last U.S. troops left Vietnam.
Sunday, March 1, 2026
Monday, March 2, 2026
Wednesday, March 4, 2026
Thursday, March 5, 2026
Friday, March 6, 2026
Saturday, March 7, 2026
Sunday, March 8, 2026
Monday, March 9, 2026
Tuesday, March 10, 2026
Wednesday, March 11, 2026
Thursday, March 12, 2026
Saturday, March 14, 2026
Sunday, March 15, 2026
Thursday, March 19, 2026
Friday, March 20, 2026
Sunday, March 22, 2026
Tuesday, March 24, 2026
Thursday, March 26, 2026
Saturday, March 28, 2026
Sunday, March 29, 2026
Monday, March 30, 2026

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