However , the team elected to remain in the D - 3 Pro League .
In September 1999 , the Pioneers expressed an interest in moving up to the A-League after winning the USL D - 3 Pro League .
The team elected to remain in the D - 3 USL D - 3 Pro League   .
In September 1999 , the Pioneers expressed an interest in moving up to the A-League after winning the USL D - 3 Pro League .