The John Chard Medal is a military long service medal which was instituted by the Union of South Africa on 6 April 1952. Until 1986, it was awarded to members of the Citizen Force of the South African Defence Force for twelve years of efficient service and good conduct. The period of qualifying service was reduced to ten years in 1986.

The Efficiency Medal (South Africa) was instituted in 1930 for award to part-time warrant officers, non-commissioned officers and men after twelve years of efficient service on the active list of the Citizen Force of the Union of South Africa. At the same time, a clasp was instituted for award to holders of the medal upon completion of further periods of six years of efficient service. The medal superseded the Colonial Auxiliary Forces Long Service Medal.