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Signal operating instructions (SOI) or Communications-Electronics Operation Instructions (CEOI) are U.S. military terms for a type of combat order issued Signal operating instructions (SOI) or Communications-Electronics Operation Instructions (CEOI) are U.S. military terms for a type of combat order issued Signal operating instructions refer to a series of orders, issued for technical control and coordination of the signal communication activities of a command Signal Operating Instruction SECTION 3 - Message Communications Instruction . SECTION 4 - Radio Communications Instructions .Signal operating instructions or Communications-Electronics Operation Instructions are U.S. military terms for a type of combat order issued for the Signal operating instructions or Communications-Electronics Operation Instructions are U.S. military terms for a type of combat order issued for the . Advising the corps commander on all signal activities. b. Preparing signal operation instructions (SOI) for approval. c It covers the use of the signal operation instructions (SOI), and the techniques that apply to the operation of radiotelegraph (international Morse code),