Question: Which professional American football league were James Harrison and Eric Norwood affiliated?

Context paragraphs:
Norwood Oval: Norwood Oval (currently known as Coopers Stadium due to sponsorship from the Adelaide-based Coopers Brewery) is a suburban oval in the western end of Norwood, an inner eastern suburb of Adelaide, South Australia.  Norwood, Payneham & St Peters Council own the Oval but rent it to the Norwood Football Club.  It has been used for a variety of sporting and community events including baseball, soccer, rugby league and American football, but its main use is for Australian rules football.  It is the home ground for the Norwood Football Club ("The Redlegs") in the South Australian National Football League (SANFL).

China Arena Football League: The China Arena Football League (CAFL) is a professional arena football league that plays its games in China.  It features players from the Arena Football League (AFL) and other indoor football leagues' rosters while also using players from China or who are of Chinese descent, The six team, eight-on-eight football league consists of four Chinese players and four "foreign" players on the field at a time.  The league began play in the fall of 2016.  It is the first professional American football league to play in China.  The CAFL is not directly affiliated with the AFL and is instead owned by AFL Global, LLC, a company that was created by Martin E. Judge, Jr.

Eric Norwood: Eric Norwood (born May 24, 1988) is former American football defensive end.  He was most recently a member of the Saskatchewan Roughriders of the Canadian Football League.  He was a member of the Hamilton Tiger-Cats of the Canadian Football League from 2013 to 2015.  He formerly played for the University of South Carolina.  During his collegiate career, he set school career records in tackles for loss (54.5) and quarterback sacks (29).  With numerous conference and national honors, Norwood is one of the most decorated defensive players in SEC history and has drawn comparisons to James Harrison.  Norwood was considered a top linebacker prospect for the 2010 NFL Draft; he was selected in the fourth round, 124 overall by the Carolina Panthers.

James Harrison (American football): James Henry Harrison Jr. (born May 4, 1978) is an American football linebacker for the Pittsburgh Steelers of the National Football League (NFL).  He played college football for Kent State University, and was signed by the Steelers as an undrafted free agent in 2002.  A five-time Pro Bowl selection, Harrison has earned two Super Bowl rings with the Steelers, in Super Bowl XL and Super Bowl XLIII.  Harrison also played for NFL Europe's Rhein Fire and had a brief stint with the Baltimore Ravens.  He played 10 games for the Cincinnati Bengals in 2013.  Soon after his season in 2013 with Cincinnati he stated that he would be retiring from the NFL, but he came out of retirement to return to the Steelers.  Harrison is the Steelers' all-time sack leader, with 79.5.

John Harrison (footballer, born 1961): John James Harrison (born 7 June 1961) is an English former professional footballer who played as a defender in the Football League for York City, and in non-League football for Leeman United and Osbaldwick.

New York Yankees (1936 AFL): The New York Yankees of the second American Football League was the second professional American football team competing under that name.  It is unrelated to the Yankees of the first AFL (and the National Football League), the Yankees of the third AFL, the Yankees of the American Association (then also called the American Football League) and the (later) Yankees of the All-America Football Conference.  The Yankees played their home games in Yankee Stadium and Triborough Stadium in New York, New York.  Jack McBride was the team’s head coach throughout its existence; Yankees' president James Bush served as president of the second American Football League in 1936.

Association of Professional Football Leagues: The Association of Professional Football Leagues was a compact formed in 1946 among the National Football League and three minor leagues of professional American football: the American Association (which subsequently changed its name to the American Football League), the Dixie League, and the Pacific Coast Professional Football League.  While the NFL had an informal farm system in the pre-World War II AA, this was the first time in which it had a working arrangement with multiple leagues whose local popularity rivaled that of the major league.  The agreement lasted less than two years, its termination triggered by the folding of the Dixie League after one of its members jumped to the American Football League one week into the 1947 season.

Jim Harrison (American football): Hulet James Harrison Jr. (born September 10, 1948) is a former American football running back in the National Football League.  He was drafted by the Chicago Bears in the second round of the 1971 NFL Draft.  He played college football at Missouri.

American Football League: The American Football League (AFL) was a major professional American football league that operated from 1960 until 1969, when it merged with the National Football League (NFL).  The upstart AFL operated in direct competition with the more established NFL throughout its existence.  It was more successful than earlier rivals to the NFL with the same name, the American Football League (1926), American Football League (1936), and American Football League (1940).

List of National Football League head coaches: The National Football League (NFL) is a professional American football league consisting of 32 teams, divided equally between the National Football Conference (NFC) and the American Football Conference (AFC).  The NFL is one of the four major professional sports leagues in North America, and the highest professional level of American football in the world.  The NFL was founded in 1920.  In the course of its existence, it has merged with the All-America Football Conference and the American Football League (AFL) to create the current NFL.  The All-America Football Conference merged with the NFL in , and the AFL merged with the NFL in .  The history and records of the AFL were incorporated into the NFL.

Supporting paragraphs: Eric Norwood James Harrison (American football)
Answer: NFL