Er, what "immature attitude"? I don't see any reason to doubt that the Navy has such a reputation. The progress of the investigation, and its competence at differentiating between lawful fair use and illicit bootlegging (if any), will illustrate whether or not the reputation is justified.
An attitude displayed seriously only by those with no knowledge of military service, or the cooperation (and rivalry) between the services. Base your knowledge of these 'reputations' on something besides the smart-alec comment of a high school graduate who is only beginning his journey in life. He will learn much in the years ahead of him in the service of his country, and one of the things he will learn is that the all the services all have roles and responsibilities in the defense of our nation. It actually speaks volumes of 'Thud' that he bases his opinion of the 'Sea Service' on the offhand comment of a teenager.
As to the investigation, the facts will reveal the truth, and if innocent, then they will be aquitted. And the reputation of the service academy will be based upon the fairness of application of the code. My personal opinion, and having graduated from there, is that this would not have been elevated to this level to begin with if there was not something to the charge.