Master-General of the Ordnance
The Master-General of the Ordnance (MGO) was a very senior British military position from 1415 to 2013 (except 1855–1895 and 1939–1958) with some changes to the name, usually held by a serving general. The Master-General of the Ordnance was responsible for all British artillery, engineers, fortifications, military supplies, transport, field hospitals and much else, and was not subordinate to the commander-in chief of the British military.
Source: Wikipedia — Master-General of the Ordnance (CC BY-SA 4.0)