Um...this would be forgery of an internal military document. Federal offense.
The TXANG is not a Federal organization.
I understand that you want it to be one, and I'll believe you if you can give me a cite or piece of case law that fits this fact pattern. Before you do though, please do take the time to review the comments and citations already covered. I've gathered up the links to make that a bit easier for anybody who want to build a solid argument, one that would actually hold up in court.