JACKSONVILLE, Fla. -- A Navy lawyer at the Naval Air Station-Jacksonville is facing a military trial that could put him behind bars for 30 years after Navy officials charged him with passing along secret information while he was stationed at Guantanamo Bay.

Lt. Cmdr. Matthew Diaz is accused of mailing a multi-page document containing classified information to an unauthorized, non-government entity.

According to authorities, the document allegedly mailed by Diaz contained the names and other information about detainees at Guantanamo Bay, a detention camp that houses suspected terrorists.

Diaz was stationed at Guantanamo from July 2004 through January 2005 and worked as a Staff Judge Advocate. A Navy spokeswoman said it was during that time that Diaz had access to the secret information.

"A multi-paged, classified document containing the names and other identify information concerning individuals being detained at Guantanamo Bay was allegedly mailed from Guantanamo to a non-governmental organization," said Navy spokeswoman Beth Baker.

Diaz is charged with eight counts of copying secret government information and giving that secret information to someone else.

"The non-governmental organization turned that classified document over to the appropriate federal authorities," Baker said.

The Navy has not released information about the group that received the classified materials, saying that information would be made public in a hearing in October.

Diaz is not currently in custody. He remains on active duty, but is on administrative duties.

He's scheduled for a Navy Article 32 hearing in Norfolk in October, and then could face a court martial.

If found guilty, Diaz would be dismissed from the Navy and could be sentenced to 30 years in jail.