Incident Officers attended air raid incidents and managed the various services as they attended to the incident. They were the central point in ensuring that all the available resources were dealing with the situation at hand. If needed they could call up additional resources or redirect newly arrived teams back to base if he/she thought the incident was being dealt with sufficiently well. The sign on the photo below was erected at incidents so the IO could be easily found. The flag below the sign is usually blue in colour (and sometimes in blue and white checks) and the IO sometimes wore a plain blue helmet colour to stand out from other members of the CD services.
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