Does anyone know what the rules are for the wearing of red cross emblems. The only thing I can find is on the ICRC's website which says they should be a red cross on a white background made from a waterproof material (by which I take it to mean won't run if it gets wet rather than made of gortex) and must be worn on the left arm. I have been told that to be valid they should have a unit stamp on them and that capbadged medical personnel should wear a larger red cross than non-badged personnel support staff but I cannot find those requirements anywhere. From a practical point if view would a TRF sized (or slightly bigger) red cross on a white background on the PCS blanking panel meet the requirements? Or perhaps a white blanking panel with a red cross on. Would there be a problem having the Union flag on the white panel? Could we use a round white badge on the blanking panel? -which would allow it to be slightly bigger.