Based upon your question, it appears that you were continuing to pay "back" support until very recently, and your support obligation is now terminated. If that is accurate, there would be no reason for any additional hearings in domestic relations court that would address your income, so your Army retirement check should be safe from that process.
When you were divorced, your settlement agreement or court order dividing assets would have addressed your retirement benefits. You should look to either of those documents as to in what manner, if any, that asset was divided. If the agreement or order are silent as to that issue, or if you only had a divorce count and neither of you raised a claim for equitable distribution, then the issue is waived and your ex would have no claim to your Army check.
Answered on Feb 13th, 2014 at 3:08 PM