Who wears what size red cross is governed by the Geneva Conventions. FIdent 107, and full-size red cross, is issued to medical personnel directly involved with patients such as doctors, nurses, chaplains and so on. FIdent 106, and small red cross, is issued to support personnel such as cooks and drivers.
The FIdent 106/107 confers a special status on the holder if they becom PW - providing, of course that the captors subscribe to the Conventions. Essentially, PW med personnel should only be employed on medical duties, and should be exchanged at the earliest opportunity.
Or is it because you dislike people who know more than you, Smithy...........
Are you suggesting as an Ex RSM of a med unit I didnt know the rules governing red crosses. Get with it. What it does show is that you haven't been attending your annual training or you would have known it.
Stick to your job that doesnt contain drinking and colourful language. What 7 years didn't train you to do was sharpen up thats for cetain. Dullard.