Moral Standards
The United States Military Services make every attempt to assess the moral quality of potential recruits, and several categories of moral offenses may preclude enlistment. This is primarily accomplished based on criminal record.
I should note here that there is no such thing as a "sealed record," or an "expunged record" as far as the military is concerned. The recruiting services have access to law enforcement and FBI investigative records, which -- quite often will list arrests in these categories.
With this in mind I would be willing to be that you have been barred from enlistment in to any branch of the military.