Browsing: nonappropriated funds employment

Q. I was a nonappropriated funds government employee from 1979 to 1990 holding UA7, UA8 and UA9 positions (AAFES and Army NAF). I resigned in 1990 and have worked in the private sector since. Now I plan to return to federal government employment as a GS5 or GS7. How will my service time count toward retirement, and is it possible to repay my NAF pension funds into the system? Also, how will my accrued sick leave be handled?