I am surprised the the Defense Investigative Service isn't asking Rather some hard questions right about now. Forging official government documents is a felony under US statutes on counterfeit and forgery. Forgery isn't just producing the document. It is also unlawful to pass it off as legitimate knowing that it isn't.
This is exactly what I've been wondering too. It is a federal crime to forge a government document of any kind right? At some point a federal agency must investigate. Whomever did this forgery didn't think of that. Beavis and Butthead did this, like it was just any old letter from an employer or position of authority. Like a letter from the principal or the teacher, these guys are definitely juvenile, in mind, at least. Unimpeachable sources my a**.