WaThe application for issuance of a Reentry Permit, Form I-131, must be submitted prior to departure from the?

what does this mean?"The application for issuance of a Reentry Permit, Form I-131, must be submitted prior to departure from the United States"

Answer:
I am impressed that you would even TRY handling immigration stuff without a lawyer. My wife and I are using Susan Larrance in Seattle. We are not worried at all about how things will turn out because she is a true professional.
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