Membership in Rocket City Federal Credit Union is available under one of the following instances; (1) Individual requesting membership works for an employer who is a designated sponsor group of the Credit Union. Primary Sponsor Groups are the City of Huntsville, Huntsville Utilities, Madison County Commission, Huntsville Library, Von Braun Center, Huntsville Housing Authority, and Huntsville Museum of Art. Additional employer groups are also in the field of membership. (2) The second means of membership eligibility requires that an immediate family member from one of the primary groups have an existing account.