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OP-20-G or "Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security", was the U.S. Navy's signals intelligence and cryptanalysis group during World War II. Its mission was to intercept, decrypt, and analyze naval communications from Japanese, … 展开
The Code and Signal Section was formally made a part of the Division of Naval Communications (DNC), as Op-20-G, on July 1, 1922. In January … 展开
In February 1942 power struggles within the Navy resulted in the sidelining of Laurance Safford, with the support of Admirals 展开
• Andrew Gleason, one of the OP-20-G members during World War II
• Fleet Radio Unit
• United States Naval Computing Machine Laboratory
• US Army SIS 展开• "The Pacific War: The U.S. Navy, Naval Intelligence as of Pearl Harbor". Retrieved 2006-12-07.
• "The National Archives: Records of the National Security Agency/Central Security Service". Retrieved 2006-12-07. 展开In the early hours of the morning of 7 December 1941, the U.S. Navy communications intercept station at Fort Ward on Bainbridge Island, Washington, picked up a radio … 展开
• (July 1922-March 1935) Code and Signal Section (Op-20-G), Division of Naval Communications (DNC), OCNO (July 1922-March 1935).
• (March 1935-March 1939) Communications Security Group (Op-20-G), DNC, OCNO 展开• Budiansky, Stephen (2000). Battle of Wits: The Complete Story of Codebreaking in World War II. New York: Free Press. 展开
CC-BY-SA 许可证中的维基百科文本 On-the-Roof Gang: The U.S. Navy’s Cryptologic Pioneers
Navy cryptanalysts at Station HYPO and OP-20-G made a breakthrough in the decryption of JN-25B in February 1942 and began to partially decrypt Japanese messages. It was clear to the …
Navy Cryptology: The Early Days > National Security …
2021年8月20日 · The Navy itself was small, and Navy cryptology began with a very small organization -- even by 1941, OP-20-G had only about 60 persons plus small field contingents. …
String Quartets, Op. 20 (Haydn) - Wikipedia
The six string quartets Op. 20 by Joseph Haydn are among the works that earned Haydn the sobriquet "the father of the string quartet". The quartets are considered a milestone in the history of composition; in them, Haydn develops compositional techniques that were to define the medium for the next 200 years.
The quartets were composed in 1772 at a time of tensions in Haydn's life, an…Wikipedia · CC-BY-SA 许可下的文字- 预计阅读时间：8 分钟
OP-20-G — Wikipédia
La mission de l'OP-20-G est l'interception, le décryptage et l'analyse des transmissions navales allemandes, japonaises et italiennes. En outre, l'OP-20 …
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OP-20-G | Military Wiki | Fandom
OP-20-G or "Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security", was the US Navy's signals …
Op-20-G - Dayton Codebreakers
OP-20-G or “Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security”, was the U.S. Navy’s signals …
History Op-20-G-4E/ late 1945 - Dayton Codebreakers
The Naval Communications Branch of Op-20 (Op-20-G) during the early part of 1942 had need of technical assistance for the development and construction of certain specialized equipment. A …
Naval Security Group Disestablishment :: Information Warfare :: …
2005年9月30日 · The group was re-designated OP-20-G as a secret staff under the Director of Naval Communications. They began training significant numbers of intercept operators in how …
About: OP-20-G - DBpedia Association
OP-20-G or "Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security", was the U.S. Navy's signals …
