The medal could be awarded to part-time warrant officers, non-commissioned officers and men after twelve years of continuous efficient service on the active list of the Militia, the Territorial Army or of any other Auxiliary Military Force of the British Empire. War service was reckoned two-fold, as did service in West Africa, although service by natives of West Africa and periods spent on leave counted only singly. Service during the period from 3 September 1939 to 1 March 1950 inclusive need not have been continuous, while breaks in service under certain specified conditions, though not counting as qualifying service, were not considered as a break in the twelve years of continuous service qualifying for the medal.