Hi Ian
The Dekoratie voor Trouwe Dienst (Decoration for Devoted Service), post-nominal letters DTD, was instituted in terms of Government Notice no. 2307 dated 21 December 1920 and published in the Union of South Africa Government Gazette of 24 December 1920. It was a retrospective award for distinguished and especially meritorious service by Boer veteran officers during the Anglo-Boer War between 11 October 1899 and 31 May 1902.
The Dekoratie voor Trouwe Dienst could be awarded to officers of the military forces of the South African Republic and the Orange Free State whose service during the Anglo-Boer War of 1899 to 1902 had been of such a distinguished and meritorious nature that, in the opinion of the Minister of Defence, they deserved special recognition. Recipients had to be serving members of the Union Defence Forces, or available to be called up for service in terms of the South African Defence Act of 1912.
Order of wear
Even though the Dekoratie voor Trouwe Dienst was instituted on behalf of King George V by His Royal Highness, the Governor General of the Union of South Africa, the decoration was never listed in the order of wear prescribed by the British Central Chancery of the Orders of Knighthood.
South African military decorations order of wear
In the South African order of wear, however, the Dekoratie voor Trouwe Dienst took precedence in wearing and officially ranked above the British Distinguished Service Order. With effect from 6 April 1952, when a new South African set of decorations and medals was instituted to replace the British awards used to date, the older awards continued to be worn in the same order of precedence but, with the exception of the Victoria Cross, took precedence after all South African orders, decorations and medals awarded to South Africans on or after that date.