[MLS TRANSACTIONS] D.C. United signed 30-year-old Argentine Emiliano Dudar from Young Boys of Switzerland, where he hasplayed since 2007, in a bid to bolster its young backline. The Colorado Rapids added 28 -year-old Colombian attacking midfielder Jaime Castrillon fromIndependiente Medellin. American fans will remember him as the scorer of the lone goal in Colombia’s 1-0 victory over USA in the 2007 Copa America. The New York Red Bulls has signed 25-year-oldAmerican goalkeeper Jeremy Vuolo, who spent 2011 with AC Oulu in Finland’s Ykkonen (second level). For all the offseason player movement …

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