Awarded for 15 years exemplary conduct, with second award bars for each further 10 years service.
This is the issue with the DEI GRATIA legend that has been awarded from 1954 when the legend was changed.
In 2016 the medal was extended to Commissioned officers who were serving on or after 29th July 2014, at the same time the qualifying criterai was amended and applied to OR's as well (from 1st October 2016 for OR's). The criteria for all is 15 years of good conduct from the date of any offence which would previously preculded the award of the LSGC. Bars are now awarded for additional periods off 10 years. The criteria was not made retrospective.