The 1999 D.C. United season was the clubs' fifth year of existence, as well as their fourth season in Major League Soccer. Following shortcomings in MLS Cup '98, United took winning the league championship as their top priority entering 1999. With Bruce Arena's departure to coach the United States men's national team, Dutch coach Thomas Rongen took the helm as United head coach. Rongen's maiden campaign with United proved by incredibly successful, as United earned their third MLS Cup title, and their second MLS Supporters Shield.