McDonald's USA President Jan Fields is leaving the company after more than 35 years. | AP
Don Thompson
McDonald’s has struggled with increased competition and a lack of new products. | M. Spencer Green~AP
The head of McDonald’s U.S. operations is out, despite her long friendship and years of working with CEO Donald Thompson, in what the fast-food giant described as a business decision. Jan Fields, 57, who has been with Oak Brook-based McDonald’s more than 35 years, will …
