The ????? is Military Cross. The Non article 5 / QGJ one looks more like the Distinguished Service Cross and the Long Service Good Conduct is 15 years.
The non-Art 5 is definitely that - note the silvery thread running down the middle - I got mine out of the drawer to check. Yes, realise that LS+GC is for 15 years service, but was questioning the minimum amount of time required as a rating/SR before transferring UY/SUY/SD that allows you to make up the balance of the 15 years as an Officer. Agree MC.