Many many discrepancies across the board I am afraid. It highlights just one of the many inconsistencies with the issue of medals for civilian and at times military service, which leaves many public servants whether civilian or military frustrated and undervalued,
For example the prison service qualified for the Jubilee and Coronation medals. NCA and BF & IE did not. Of course many dismiss such medals as 'mehh' and not worth anything, but of course the same dissenters are the ones still sporting them on their medal bars regardless.
No rhyme or reason to many decisions, many of which especially within the civilian world are made by senior civil servants within government who have little understanding of the departments they are in charge of.