Artificer Sergeant Major (ASM) is an appointment held by a Warrant Officer

Warrant Officer

A warrant officer is an officer in a military organization who is designated an officer by a warrant, as distinguished from a commissioned officer who is designated an officer by a commission, or from non-commissioned officer who is designated an officer by virtue of seniority.The rank was first...

 Class 1 in the Corps of Royal Electrical and Mechanical Engineers (REME), the corps of 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...

 whose function is the repair and recovery of all mechanical and electrical equipments.

The ASM is normally the senior tradesman in a unit Light Aid Detachment

Light Aid Detachment

A Light Aid Detachment is an attached independent minor unit of the Royal Electrical and Mechanical Engineers or Detachment of Royal Canadian Electrical and Mechanical Engineers operating as a sub-unit of the supported unit...

 (LAD) and is the technical advisor to the unit. An ASM must have passed the Artificer training course and served as an Artificer Weapons/Vehicles or similar discipline as a Staff Sergeant

Staff Sergeant

Staff sergeant is a rank of non-commissioned officer used in several countries.The origin of the name is that they were part of the staff of a British army regiment and paid at that level rather than as a member of a battalion or company.-Australia:...

 and Warrant Officer Class 2 (holding the appointment of Artificer Quartermaster Sergeant) prior to promotion to WO1.