There could be a huge gap in varying expectations for such an answer.
The initial standard that you'll need to know would be your bleep test score which has very recently dropped from 11.6 to i believe its 9.9 of which I'm sure you can agree is very easily achievable.
For 5/10k I'd personally suggest that as long as you are running 8 minute miles comfortably then you'll be fine. That being said the fitter you are when you do join the easier basic training is.
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