Ever since World War II, American teams have played in European Leagues (usually in US Army Leagues stationed around the World), or have played matches against teams from around the World (usually Under 19/20 representative teams from the USA).
United States Air Force & Army Leagues:
American Expeditionary Force Football League 1918-1919
European Theater of Operations Championship 1942-1944
United States Air Force in Europe Football League | Finals 1952-1993
United States Air Force in Europe | United Kingdom Sports Conference 1951-1993
Intercontinental Football League College and Air Force Games 1972-1973
United States Armed Forces in Europe | Northern Italian League 1974-1975
United States Air Force & Army Leagues | Teams:
