Military Call Signs
In wartime, monitoring an adversary's communications can be a valuable form of intelligence. Consistent call signs can aid in this monitoring, so in wartime, military units often employ tactical call signs and sometimes change them at regular intervals. In peacetime, some military stations will use fixed call signs in the international series.
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—Richard Bluel, and Henry Hathaway. Major Hugh Tarkington (Clinton Greyn)
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—Saul Kripke (b. 1940)
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—Friedrich Nietzsche (1844–1900)