Comments:

Frank Brandt  was a soldier who was convicted by court marshal of some military offense and sentenced to the prison on Alcatraz, where he died.  The lack of a cross or other emblem on his tombstone reflects his inmate status.  Army inmates on Alcatraz were designated either as "general prisoners" or "military convicts."  General prisoners were sentenced to Alcatraz for a period of time, but after that had been served they would be returned to their units and allowed to serve the rest of their enlistment.   Military convicts like Brandt, however, had been dishonorably discharged and were spending the rest of their enlistment periods (or longer, if the offense was serious enough) in confinement.