Criminal Law Questions? Ask a Criminal Lawyer.
Yes. He should, and will likely be, provided with a Navy defense counsel. Whether the hearing is a preliminary hearing (known as an Article 32), a court date (court-martial), or an administrative separation hearing, he's entitled to military counsel at no expense. He's also entitled to hire his own civilian counsel, at his expense. If he chooses to do so, the attorney should be experienced in criminal defense, and preferably in military courts-martial.
Please let me know if you need anything clarified.