Sounds like you need a divorce lawyer ASAP. A governmental plan is not required to comply with federal rules concerning division of assets in divorce. On the other hand, a governmental plan
is required to comply with applicable state and local laws (both those governing division of assets generally, and those governing treatment of pension assets). Someone with experience in the local law of that municipality could advise you on your rights.
The mere fact that benefits under the plan are not vested if he leaves does not cause his plan benefit to have no value. In the first place, even when employer-provided benefits are not vested, a plan may well provide for a lump sum payout of employee contributions plus interest. In the second place, even if you cannot get an immediate cash settlement on the plan, you may (depending on state and local law) be able to arrange to get a percentage of the benefit if and when it is paid out.
Obviously, I cannot provide you with legal advice outside of an attorney-client relationship. And since I'm not in Pennsylvania, I probably wouldn't be the best person to provide you with advice anyway. But as someone who has been through a divorce, complete with division of pension assets, I can strongly advise you to consult a divorce lawyer with experience in your jurisdiction right away.
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Employee benefits legal resource site