The United Services Automobile Association (USAA) is a San Antonio-based Fortune 500 diversified financial services group of companies including a Texas Department of Insurance-regulated reciprocal inter-insurance exchange and subsidiaries offering banking, investing, and insurance to people and families who serve, or served, in the United States Armed Forces. At the end of 2017, it had 12.4 million members.USAA was founded in 1922 in San Antonio by a group of 25 U.S. Army officers as a mechanism for mutual self-insurance when they were unable to secure auto insurance because of the perception that they, as military officers, were a high-risk group. USAA has since expanded to offer banking and insurance services to past and present members of the Armed Forces, officers and enlisted, and their families. The company ranked No. 100 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.