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The question of the division of military retirement isn't one that is answered entirely by military law. Let me explain. back in the 80's, military retirement couldn't legally be divided by state courts, because it was a federal benefit and the rule of preemption doesn't allow a state law to overstep a federal one.
Congress recognized this as an issue and passed a law allowing state courts to divide military retirement. However, while that law allows a state court to divide military retirement, it does not dictate how that division has to take place. All the law does is grant state courts the same right to divide military retirement as they already had to divide civilian forms of retirement.
So, a former spouse is not entitled to any specific result in a divorce and only obtains a legal right to military retirement division if the state court, during the divorce, orders a division in the decree. Your former spouse would be entitled to 50% of your retirement only if your divorce decree specifically states that she is entitled to 50% of your retirement. Without that statement in the decree, she has no entitlement.
If the decree does grant her 50% of your retirement, that grant is permanent unless it specifically states that it is not. It is not an award that fluctuates based on either of your financial positions, like child or spousal support might.
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