It is, though. > (U) Definition: Special Intelligence, or SI, Is a sensitive compartmented information (SCI) control system designed to protect technical and I

It is, though. > (U) Definition: Special Intelligence, or SI, Is a sensitive compartmented information (SCI) control system designed to protect technical and Intelligence Information derived from the monitoring of foreign communications signals by other than the intended recipients. The SI control system protects SI-derived Information and information relating to SI activities, capabilities, techniques, process and procedures. Page 80 here: https://fas.org/sgp/othergov/intel/capco_reg_v6-0.pdf https://fas.org/sgp/othergov/intel/capco_reg_v6-0.pdf