On the printed division signs, the RCE was in red on a blue rectangle imposed on the division sign, except for 2 CID, which was a blue patch and only the RCE was printed. In this image, the sapper appears to be wearing a sign without the second blue rectangle, which indicates it is likely 2 CID. If there is a rectangle around the RCE, the light colour would suggest 3 CID.
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Res ipsa loquitur
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