Vallow spent the 2002 season shuttling between the USL and MLS, as he was signed and released by both the New England Revolution and the Dallas Burn; Vallow also played for the Rhinos, making eight appearances and sharing duties with Pat Onstad.
In 2016, Vallow managed the team whenever Riley was suspended by officials, which occurred three times during the 2016 season, including most of the team's 2016 semifinals match against Portland Thorns FC and the entirety of the 2016 NWSL Championship match [REF].