Yes, I think NSF's can be attached out to SAFSA (whatever sport)
after their BMT, though not on a permanent basis - i.e. they have
an initial NS unit &, I believe, vocation as well.
Their football team plays in the National Football League, Division
2. Not sure about the formal arrangements with the SAFFC
club.
Google for the SAFSA Secretariat address & contact them to see
if they conduct trials, etc.