Chirurgeon
A chirurgeon is a medieval surgeon.
Chirurgeons in the SCA
A chirurgeon is a first-aid officer within the SCA. If there are any first-aid issues that need to be tended to, then these are the people you see. Chirurgeons must hold at least a level 2 first-aid certificate, and report any incidents that occur during an event.
Note that they are not expected to do anything more than first-aid. If serious medical attention is required, a chirurgeon should seek the services of outside trained personnel, or tell the injured person to do so.
Also, a chirurgeon may only enter a field of combat at the request of a marshal. Likewise, the laws are written in such a way that a chirurgeon is urged to get injured people off the battlefield as fast as possible. Of course, that is not always possible.