The term Medical Support Officer is the name given to Commissioned Officers within the British Army

British Army

The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...

's Royal Army Medical Corps

Royal Army Medical Corps

The Royal Army Medical Corps is a specialist corps in the British Army which provides medical services to all British Army personnel and their families in war and in peace...

 (RAMC) who are principally responsible for the leadership, command, control and management of the RAMC.
The main role of the RAMC is to provide healthcare to the British Army in barracks and on operations, however leadership, command and control functions within the Corps are undertaken principally by Medical Support Officers.