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"On This Date in History" Calendar

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

September 2021

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S M T W T F S
29 30 Aug 31 Sep 1 2 3 4
1939: Army's SIS Translates PURPLE
1918: Hudson Field Code
1968: "Star Trek: The Enterprise Incident"
1943: First Bombe to Nebraska Ave.
1945: Japanese Surrender Event
1983: KAL 007 Shot Down
1958: C-130 Shot Down
1997: National Vigilance Park Dedicated
5 6 7 8 9 10 11
1972: 11 Israeli Olympic athletes & German policeman killed.
1941: Winston Churchill Visited Bletchley Park
1983: Inventor Boris Hagelin Died.
1947: Grace Hopper & the First Computer "Bug"
1877: Frank Moorman (AEF Radio Intel) was born.
1940: Army & Navy Joint Exploitation of PURPLE
2001: al-Qaeda Attacks in U.S.
12 13 14 15 16 17 18
1918: U.S. Offensive on the Saint-Mihiel
1945: Signal Security Agency becomes ASA
1971: Cryptologic Pioneer Agnes Driscoll Died
1967: David Kahn's book, "The Codebreakers" was published.
1947: USAF Established
1946: Elizebeth Friedman departs the U.S. Coast Guard.
1892: Birth of Philip Johnston - whose idea to use the Navajo language as a code during WWII would save countelss lives.
19 20 21 22 23 24 25
1956: First Civilian NSA Deputy Director Joseph Ream
1983: Three Inventors Receive Patent for Encryption Algorithm RSA
1957: First NSA Open House
1980: Iran-Iraq War Began
1780: Treasonous Ciphered Letter
1891: American Cryptologic Pioneer William Friedman Born
1918: "Colorado" Field Code Issued
1807: Alfred Vail, Telegraph Co-Inventor Born
26 27 28 29 Sep 30 Oct 1 2
1918: Meuse-Argonne Offensive
1940: Purple Analog #1 Started Decryption
1978: Fort Meade Protective Service
1924: Edward Hebern Received Patent
1967: First Vice-Presidential Visit to NSA
1953: Frank Moorman Died
1986: President Reagan Dedicated NSA Ops Bldgs
Wednesday, September 1, 2021
Thursday, September 2, 2021
Saturday, September 4, 2021
Sunday, September 5, 2021
Monday, September 6, 2021
Tuesday, September 7, 2021
Thursday, September 9, 2021
Friday, September 10, 2021
Saturday, September 11, 2021
Sunday, September 12, 2021
Wednesday, September 15, 2021
Thursday, September 16, 2021
Friday, September 17, 2021
Saturday, September 18, 2021
Sunday, September 19, 2021
Monday, September 20, 2021
Tuesday, September 21, 2021
Wednesday, September 22, 2021
Thursday, September 23, 2021
Friday, September 24, 2021
Saturday, September 25, 2021
Sunday, September 26, 2021
Monday, September 27, 2021
Wednesday, September 29, 2021
Thursday, September 30, 2021

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