Indeed a very valid discussion.... I have my own opinion about it, but I better keep it that way
No seriously.... I don't see the need to paint red crossed on Helmets and gasmasks.
Like you said , the red cross was used on ammo cans to indicate there is medical stuff inside....
Now I know a lot of people think that germans would throw away their gasmasks and put all kind of stuff inside their cannister, but I allways have found that a tell tale.... Probably there are some who did that in the end (when running), but certainly not when they were a fighting unit under command of an (non com.) officer. There are very strict instructions about gas masks until the very end of the war and knowing the germans they would strictly follow these orders...
Now, it could be that in some occaisions (on the western front) medics thought it would be in their benefit when they easily could be identified as medical personnel, and therefore it could of course be possible that red crosses were painted on , but I still have my doubts....
Like i said, just my .02 cents and of course just an opinion....
Tom
www.mp44.nl