Key legal question
Whether military insurance had to bear full liability for the Bechterew disease rather than only 50%.
Extracted holding
The 50% liability assessment was upheld because the disease predated service and was permanently aggravated during service, with the service-related share correctly set at 50%.
Extracted reasoning
The court relied on the medical opinion showing a pre-existing condition and a lasting aggravation during military service; the appellant's arguments about genetic factors and other diagnoses did not undermine that assessment.