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Arsenal Credit Union is a state-chartered credit union headquartered in Arnold, Missouri, and serving the St. Louis, Missouri metropolitan area, chartered and regulated under the authority of the Missouri Division of Credit Unions. Member deposits are insured by the National Credit Union Administration (NCUA), a U.S. government agency. As of September 2012, ACU has approximately $183.2 million in assets, more than 23,000 members and five branches. It is the 12th largest credit union in the St. Louis area and the 14th largest in Missouri, based on size. Membership is open to anyone who lives or works in St. Louis and Jefferson counties in Missouri, the city of St. Louis, or St. Clair, Madison, Monroe and Randolph counties in Illinois, along with employees of the National Geospatial-Intelligence Agency, Veterans Administration, or 14 other companies and agencies in the region, as well as members of the St. Louis-area BCTGM Union Local 4 and Iron Workers Local 396 AFL-CIO.

History
Arsenal Credit Union was founded in August 1948 as Aero Chart Credit Union, organized to serve employees of what was then known as the U.S. government's Defense Mapping Agency (now the National Geospatial-Intelligence Agency, or NGA). The name changed to Arsenal Credit Union in 1952, the year it opened its first office at the Defense Mapping Agency Aerospace Center along the banks of the Mississippi River in south St. Louis. By 1970, the credit union had $3.4 million in assets and 4,500 members.