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Thanks for the quick reply. That makes sense. It's a little harder to picture for a background e.g Asteroid belt orphan. 

Mechanically once all slots have been ticked then it can no longer be staked I'm guessing

Yeah. Training is probably the safest asset to stake. Once it's used up, you just can't use it again until it's recovered.

There's some brief guidelines for recovering spent assets on the last page of the Union Rep Guide.