In addition to the Form SSA-2490-BK, an applicant for Finnish benefits must complete
one or more special Finnish application forms. The forms to be completed vary depending
on the type of benefit claimed. The SF/USA 3A is used to claim NPS old-age benefits.
The SF/USA 3B is used to claim NPS survivor benefits. The SF/USA 3C is used to file
claims for EPS benefits.