The Defence Long Service Medal may be awarded to a member who has, on or after 14 February 1975, completed 15 years qualifying remunerated service in the Australian Defence Force. This includes efficient service in Permanent and Reserve Forces. Clasps are awarded for each further periods of five years efficient service.
The regulations state that members are not entitled to have a Defence Force service award and the DLSM at the same time.
 
Clasps
The clasp is a  bar with the Royal Cypher flanked by sprigs of wattle in the centre.