Signal operating instructions
- Signal operating instructions
Signal operating instructions (SOI) is a U.S. military term for a type of combat order issued for the technical control and coordination of communications within a command. They include current and up-to-date information covering radio call signs and frequencies, a telephone directory, code-words (for rudimentary encryption), and visual and sound signals. A designated battalion signal officer prepares the battalion SOI in conformance with the SOI of higher headquarters. [http://www.globalsecurity.org/military/library/policy/army/fm/55-30/apps.htm] Units maintained 2 copies of the SOI: a training version and a "go-to-war" version. Since the fielding of the SINCGARS system, however, the paper SOI has generally faded from Army use. Electronic SOI are now generated, distributed and loaded along with cryptographic keys. [http://findarticles.com/p/articles/mi_m0PAA/is_2_30/ai_n15674490]
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