= Signal Intelligence Service
{wiki=Signal_Intelligence_Service}
The Signal Intelligence Service (SIS) was a component of the United States Army during World War II that focused on signal intelligence (SIGINT). Its primary role was to intercept, analyze, and interpret enemy communications, particularly in relation to the German and Japanese military forces. Established in 1941, the SIS played a crucial role in gathering intelligence that informed military strategies and operations. This included deciphering coded messages and understanding the structure and tactics of enemy units.
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