The most successful retailer in American history, Sam Walton founded the Wal-mart and Sam's Club retail chains. During WW II, Walton joined the U.S. Army Intelligence Corps, supervising security at aircraft plants and prisoner-of-war camps. After being discharged, he bought a Ben Franklin variety store in Arkansas using a $-20000 loan from his father-in-law and drawing upon his own savings of $5000. This gave him the platform to experiment and pioneer many concepts that would prove to be crucial to his success throughout. The first true Wal-Mart opened on July 2, 1962 in Rogers, Arkansas.