Hey Mark,
I WWI the US medics wore red crosses on their helmets, but they were not members of the red cross, the red cross is not used by medics any more because the Red Cross has a trade marke of the symbol, and they do not allow any one else to use it, they also have the words "First Aid "copywrited in the US, and no one but the Red Cross can teach first aid, other organizations have to call it first help or emergancy response procedures or some other nonsense. I have a very low reguard for the American Red Cross, as they present them selves as a non profit benevolent organization, but they are a blood sucking bunch of greedy money grabbers. When ever there is a desaster, the first thing they do is send a camera crew to the site and film another advertizement for blood and donations, while other groups do the actual help. My understanding is that the International Red Cross is not anything like the American Red Cross, and the the IRC is a very good organization.
Best wihses
Gus