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There is no entitlement unless the court ordered a division of the military retirement in the divorce.
The law concerning military retirement and divorce does not create an automatic entitlement, regardless of the length of the marriage. All the law does is grant the state court the right to divide the military retirement at the time of the divorce. The state court can choose to do so or not, and either result would be fine under the law.
So, if this wife received an award of a portion of the husband's military retirement in the divorce decree, she is then entitled to some of it, regardless of whether or not she later earns her own military retirement.
Now, if the divorce hasn't happened yet, and both marriages overlapped both individual's military service, BOTH can argue for a portion of the other's retirement in the divorce decree.