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As this is not something that is part of the official regulations and is a commanding officer policy, they have to prove that you were actually provided with a copy of that policy and were thus deemed to be aware of the policy. This, combined with the mitigating fact you did not violate the pass itself would be your best defenses and your best chance of appealing this if the hearing officer convicts you of this, which given the total circumstances conviction on a field grade, which is the most severe, would likely not happen because of your situation unless they prove you were actually told not to leave the 250 mile radius when you received the pass.
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