Question: In what year was the National Football League policy spearheaded by Dan Rooney established?
Sentence (from "Dan Rooney"): Daniel Milton Rooney (July 20, 1932 – April 13, 2017) was chairman of the Pittsburgh Steelers, an American football team in the National Football League (NFL), and son of the Steelers' founder, Art Rooney.
Relevant evidence: Yes