Military letters?

The medal was established on March 25, 1916. It was the other ranks' equivalent to the Military Cross, which was awarded to commissioned officers and Warrant Officers (although WOs could also be awarded the MM), although it took precedence below that decoration, between the Distinguished Service Medal and the Distinguished Flying Medal. Recipients of the Military Medal were entitled to use the post-nominal letters "MM". In 1993, the Military Medal was discontinued, and since then the Military Cross has been awarded to personnel of all ranks.