Werem wrote:"During one of the German counterattack, the Germans managed to penetrate our lines up to the perimeter of the aid station. At that point I took my brazzard of my arm, picked up my '45 went outside and helped to push the Germans back The brazzard with the red cross symbol was the only visible identification that you were a medic." - Frank South 2nd Ranger Bn Medic.
If he discarded his medical identification brassard, he was not a medic at that time. To the topic starter, it was a rule for ETO medics to carry any form of weaponry, therefor it is my opinion you will never find written evidence from the US Army or government allowing ETO medics to carry such things. Of course that does not mean medics didnt carry knives and/or sidearms at the time, but one thing for sure: they probably wore it tucked away under their clothing.
That being said, I do not think it is periodly correct to equip a mannequin or yourself as a re-enactor with a weapon since it was not standard.