No decision has been made on whether to open a formal investigation.
The controversy was now public, the army had no choice but to open an investigation.
The military advocate general opened an investigation in May 2012.
It said the service had opened investigations on all four individuals.
The commission is expected to decide this month whether to open an investigation.
But the military has opened an investigation into his accusations.
Six months later, his girlfriend told the police that there was more to the story, and they opened an investigation.
German authorities also opened an investigation about the same time.
Earlier, the parents said they were opening a private investigation and urged him to meet with them.
Federal and state police authorities have opened investigations into the case.
