In 1966, Auto Workers Arlington Federal Credit Union was chartered by 30 employees of the General Motors plant. In the very beginning, the credit union was run by volunteers until staff could be hired. Over the years, other employee groups were invited to join, until in 1997 when the charter was changed to a “community” credit union and changed names to Security One Federal Credit Union. This opened up the membership to anyone who lived, worked, worshipped or attended school in Arlington or Mansfield. What started out with only 30 members and $89 in savings became a credit union with about 10,000 members and exceeded $57 million in assets.