system
Given the following post, respond as if you're commenting on Reddit:
human
[Pacific Rim: The Black] What’s the logic behind building a fully-sized Jaeger just for “training” and not give it weapons?

What’s the logic behind the Australian Government and PPDC spending potentially tens (if not hundreds) of billions of dollars along with diverting precious resources and manpower towards constructing a fully-sized “training Jaeger” just to not give it its own weapons? If you’re gonna go that far, then why not just go ahead and at the very least give it basic weapons like machine guns? 

The only legitimate reason why I would see the Australian Government and PPDC spending this much time, money, resources, and manpower towards building an unarmed Jaeger would be to give Ranger cadets “field experience” by giving them the chance to actually pilot a real Jaeger in a sort of practical application exercise. But that seems like such a waste of a perfectly capable Jaeger.
gpt
As the show is not out until Thursday, we can only speculate. 

More than likely, it's an older model or a prototype. It'd cost more to upgrade it so the PPDC probably just decided it's best to use for training instead.