The next year, as McMillon studied for a Master of Business Administration (MBA) from University of Tulsa, he called Walmart and told an executive he was interested in training to become a buyer when he completed his studies. Soon thereafter, McMillon rejoined Walmart as an assistant manager at a Tulsa, Oklahoma, store. After completing his MBA in 1991, McMillon moved to Walmart's Bentonville headquarters to join the buyer-training program. Originally in charge of buying fishing tackle, he later took on various roles as a buyer and a merchandiser, dealing in food, clothes, crafts and furnishings. He later worked as a general merchandise manager for Walmart's wholesale store division Sam's Club before taking an executive role at Walmart, overseeing toys, electronics and sporting goods, among other areas.