Pro Merito Medal of 1967 , post-nominal letters PMM , is a military decoration which was instituted by the Republic of South Africa in 1967 . It was awarded to other ranks of the South African Defence Force for outstanding devotion to duty and was the non-commissioned officers ' version of the Southern Cross Medal of 1952 ( SM ) , which had earlier been available to all ranks
Southern Cross Medal of 1952
Southern Cross Medal (1952)
Pro Merito Medal (1967)