The Efficiency Decoration, post-nominal letters TD for recipients serving in the Territorial Army of the United Kingdom or ED for those serving in the Auxiliary Military Forces, was instituted in 1930 for award to part-time officers after twenty years of service as an efficient and thoroughly capable officer. The decoration superseded the Volunteer Officers' Decoration, the Colonial Auxiliary Forces Officers' Decoration and the Territorial Decoration.
In the British Commonwealth, the decoration was gradually superseded by national decorations in some member countries, in Canada by the Canadian Forces Decoration in 1951, in the Union of South Africa by the John Chard Decoration in 1952 and in Australia by the Reserve Force Decoration in 1982. In the United Kingdom, the decoration was superseded by the Volunteer Reserves Service Medal in 1999. New Zealand continues to award the Efficiency Decoration (New Zealand) and is one of a few countries still to do so.
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