25th ALH

Hi Guys,
I know this is not the quite right forum but allot of people visit this particular site on milsurps so I am just asking this;
I need info on the 25th ALH Bi-metal badge on the right as it is 2 piece some one said once it was a militia unit pre 10ALH but who knows.
I know about the 10th ALH pretty well as a bonus to a 20 year hunt I have just secured a pristine set of the 10th ALH collar badges the Left side & Right side one very very hard to get set the cost was lets say expensive.

But someone on my mothers side was a member of these 2 and my research has been rather stilted in trying to fathom the info.

Thank you in advance for any light the forum can shed on the 25th ALH.