Pro Merito Medal of 1975 , post-nominal letters PMM , is a military decoration which was instituted by the Republic of South Africa on 1 July 1975 . It was awarded to other ranks of the South African Defence Force for exceptionally meritorious service and particular devotion to duty , and was the non-commissioned officers ' version of the Southern Cross Medal of 1975 ( SM )
Southern Cross Medal of 1975
Southern Cross Medal (1975)
Pro Merito Medal (1975)