I searched acronymfinder.com for NSF, and it turned up five rather interesting matches (the text enclosed in parenthesis was not written by me):
- Norges Sjakkforbund (Norwegian Chess Association)
- Norges Standardiseringsforbund
- Norsk Speider Forbund (Norwegian Scout Association)
- Norway, Sweden, Finland (in order, left to right)
And, surprisingly, it turned up with the match I actually wanted to see:
- Northwest Secessionist Forces (Deus-Ex game)