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If by disputing the judgment, you mean filing a dispute under the FCRA, then no.
You already have about as strong a verification of accuracy of the reported information as one will ever get. You have a court trial on the facts, albiet you did not attend, and a ruling by the court as to its accuracy. Open and shut basis for verification of accuracy should you dispute.
To contest the facts, either as to any debt or its amount, you need a new trial. To obtain a new trial, you need to motiion the court, showing some error in the judgment.
I'm not sure how being reassigned precluded service of notice of the proceeding, so that needs clarification. I would take a look at the court record and see how it establishes service of notice on the defendant.
Look up the SCRA. There are things in there about judgments and what can and cannot happen if you are military.