What swimming requirements do you need to do the GAP year at Defence?

Agatha states:
My little brother is finishing Year 12 and is interested in doing the GAP year to figure out what he wants to do. What are the swimming requirements, as he does not know how to swim. What swimming techniques does he need to know? How do they test you?
This is for the Australian Defence GAP year btw. Thank you.
My little brother is finishing Year 12 and is interested in doing the GAP year to figure out what he wants to do. What are the swimming requirements, as he does not know how to swim. What swimming techniques does he need to know? How do they test you?
This is for the Australian Defence GAP year btw. Thank you.
