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In 1923, a US Navy officer acquired a stolen copy of the Secret Operating Code codebook used by the Imperial Japanese Navy during World War I.Photographs of the codebook were given to the cryptanalysts at the Research Desk and the processed code was kept in red-colored folders (to indicate its Top Secret classification).
Phrase Word Brevity Code (c. 1979) [27] Procedure and Officer Details: 10-MAX ... You have been given clearance to transmit your message. - - Roger (Received)
==Yankee White is not a security clearance. It is a nickname for the Single Scope Background Investigation used to clear DOD personnel for presidential duties. And, as has been pointed out elsewhere, there is no clearance higher than Top Secret. The code word designators for many SAP's are themselves classified which may be what you are ...
Transponder code, the transponder code that must be set for the aircraft prior to departure and during the flight. T also stands for time, as in void time, if one is issued. A void time is an expiration time, meaning, the IFR clearance is voided if the aircraft is not airborne by the void time. [1]
Policy is set by the Cabinet Office.The Security Policy Framework (SPF) superseded the Manual of Protective Security [1] and contains the primary internal protective security policy and guidance on security and risk management for His Majesty's Government (HMG) Departments and associated bodies.
Traditionally, all family members' code names start with the same letter. [4] The codenames change over time for security purposes, but are often publicly known. For security, codenames are generally picked from a list of such 'good' words, but avoiding the use of common words which could likely be intended to mean their normal definitions.
The codes are intended for use by air, ground, sea, and space operations personnel at the tactical level. Code words that are followed by an asterisk (*) may differ in meaning from NATO usage. There is a key provided below to describe what personnel use which codes, as codes may have multiple meanings depending on the service.
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