Question: What position did the founder of Porteswart F.C.'s home ground, Mullaghacall, play for Northern Ireland?

Context paragraphs:
Organised Crime Task Force (Northern Ireland): The Organised Crime Task Force is a multi-agency law enforcement agency operating in Northern Ireland.  It was established in September 2000 following a report by New York Professor Ronald Goldstock, into the threat from Organised Crime and its role is to set the strategic direction for a multi-agency approach to tackle organised crime in Northern Ireland.  Partner agencies include the Police Service of Northern Ireland (PSNI), HM Revenue and Customs, Serious Organised Crime Agency, the Northern Ireland Executive, the Northern Ireland Policing Board, and the Home Office.  The Confederation of British Industry, Northern Ireland Chamber of Commerce, Federation of Small Businesses and Criminal Justice System Northern Ireland are also members.

Edge Hall Road: Edge Hall Road is the Wigan Warriors Rugby League club's high performance training complex and the home ground of the Wigan Warriors Senior Academy and Junior Academy teams and the former home ground of Orrell R.U.F.C..  As of March 2015 it is known as The Solid Strip Community Stadium.  The ground is located in the Orrell district of the Metropolitan Borough of Wigan, Greater Manchester.  The ground consists of the 1000 capacity all seat North stand, the terraced South stand, the East 'scoreboard' end and the high performance training centre (formerly the Orrell clubhouse).

Holm Park: Holm Park is a football stadium in Armagh, Northern Ireland.  It is the home ground of Armagh City F.C..  The stadium holds 3,000.  It is also used by Windmill Stars F.C..

Newforge Lane: Newforge Lane is a private-members' country club for members of the RUC Athletic Association, located in Belfast, Northern Ireland.  It hosts multiple sports facilities, principally the Football stadium, which serves as the home ground of the Police Service of Northern Ireland Football Club.  From 2003-11, Queen's University Football Club also used Newforge Lane as its home ground.

Portstewart F.C.: Portstewart Football Club is an intermediate, Northern Irish football club from Portstewart, County Londonderry.  The club was founded in 1968 and currently plays in the NIFL Premier Intermediate League.  The club's main colours are sky blue and navy.  Portstewart are nicknamed "The Seahawks".  The club's home ground, Mullaghacall, was officially opened in 1997 by Harry Gregg MBE.  Portstewart Reserves play in the Coleraine and District Morning League.

Solitude (football ground): Solitude is a football stadium in Belfast, Northern Ireland.  It is the oldest football stadium in Ireland, and the home ground of Ireland's oldest football club, Cliftonville.  The stadium holds 6,224, but is currently restricted to 2,530 under safety legislation.  The stadium was built in 1890.  Since 2010 Crumlin Star of the Northern Amateur Football League have also played their home games at the ground.  However they moved the Cliff in Larne for the 2013-14 season.

Julie Nelson (footballer): Julie Nelson (born 4 June 1985) is an association football defender from Northern Ireland who plays for Durham Women's F.C..  She represents Northern Ireland on the Northern Ireland women's national football team.  She previously played for Durham Women's F.C., Glasgow City F.C., Everton L.F.C., Íþróttabandalag Vestmannaeyja, and the Crusaders Newtownabbey Strikers.

The Showgrounds (Newry): The Showgrounds is a football stadium in Newry, County Armagh, Northern Ireland.  It was the home ground of Newry City F.C. and is now the home ground of their successor club, Newry City A.F.C..  The stadium holds 7,949, but is currently restricted to 2,275 under safety legislation.

Fortwilliam Park: Fortwilliam Park is a football ground in Tobermore, County Londonderry, Northern Ireland.  It is the home ground of Tobermore United F.C..

Harry Gregg: Henry "Harry" Gregg MBE (born 27 October 1932) is a former Northern Ireland international footballer and manager.  He made 25 appearances for Northern Ireland as a goalkeeper and played for Manchester United during the reign of Sir Matt Busby, with a total of 247 appearances for the club.  He is a survivor of the Munich air disaster in 1958.  Gregg also played for Doncaster Rovers and Stoke City and later went into management with Carlisle United, Crewe Alexandra, Shrewsbury Town and Swansea City.

Supporting paragraphs: Portstewart F.C. Harry Gregg
Answer: goalkeeper