The Efficiency Decoration (ED) was instituted on 17 October 1930 and replaced several former long service awards including the Volunteer Officers’ Decoration, the Colonial Auxiliary Forces Decoration and the Territorial Decoration. The ED is awarded to officers of the volunteer Military Forces throughout the Commonwealth. Initially, to be eligible for the award of the ED 20 years of qualifying service was required but this was reduced to 12 years in 1947. At this time clasps for additional periods of qualifying service were also approved. Half of any time spent in the ranks may be counted towards the qualifying period and time spent on continuous full-time service as an officer during the period 3 September 1939 until 28 April 1952 inclusive may be counted as double qualifying time.
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