Are you still actively assisting a law enforcement agency?
If so, you should talk to your contact there.
Unfortunately, asking the government to expedite never guarantees that they will say yes.
You may also want a private consultation with an attorney, to have him/her review your paperwork.
Franco Capriotti - Senior Immigration Counsel
CAPRIOTTI INTERNATIONAL LAW
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IMMIGRATION LAW PROFESSOR for 10 years -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.