The explanation for the act has been that the 80-year-old would help his grandson who had a puncture on his car.
At the time, the grandson did his military service on F17 in Kallinge.
According to the preliminary investigation that P4 Blekinge took part in.
But the 80-year-old man drove wrong with his car after the barrier was lowered and there was a red light at the guard outside F17.
The man then drove over to the other side of the road and ended up in a military protection area.
After talking to the guard, however, he was able to get out of the car and help the grandson in the right place - but is now being prosecuted for the incident.
The classification of the crime is unauthorized access to protected objects.
The 80-year-old man admits the incident, but denies the crime.