Acronym For The Us Pro Soccer Organization

What does American professional football represent? 3

All I need to know is why it is not F.I.F.A or N.C.A.A. And I can't find it anywhere and I need it for the school project.

update

4 letters is the second letter s.

USSF

United States Football Association

Abbreviation Pro

Acronym For The Us Pro Soccer Organization

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What does US Soccerization mean?
All I need to know is why it is not F.I.F.A or N.C.A.A. And I can't find it anywhere and I need it for the school project.
!!!!!!!!!!!!! I was fine today until I found it!
Literally !!! I know it by 4 letters, the second letter is s, it's not FIFA or ncaa, even this information pack we got with my ignition, it says I can't find it anywhere, and c means Little thing with scol-Project! !!!!!
We should have the same ignition design.
Are you going to Colton?