For some fans of Borussia Dortmund, an advertising deal with Rheinmetall, a major arms manufacturer, has overshadowed the run-up to the Champions League final on Saturday. Soccer, Borussia Dortmund (Soccer Team), Advertising and Marketing, Fans (Persons), UEFA Champions League (Soccer), Rheinmetall AG, Germany, Dortmund (Germany), Defense and Military Forces, Arms Trade For some fans of Borussia Dortmund, an advertising deal with Rheinmetall, a major arms manufacturer, has overshadowed the run-up to the Champions League final on Saturday. NYT > Business