Blue Federal Credit Union (formerly known as Warren Federal Credit Union) has been open since 1951. It's the largest credit union in Wyoming with assets totaling $1.12 Billion and providing banking services to more than 87,000 members. Membership: The credit union is a member-owned financial cooperative providing financial banking services to multiple member groups, but primarily serves the military, i.e. members in the armed forces. Membership is also open to immediate family of current members.