Does anyone know the process whereby a man might be classified medically unfit to serve. I am currently researching a man who was 34 years in 1939 Household Survey but shown as "Incapacitated". He seems never to have been called up and whilst I do not doubt his lack of capacity to serve, wonder how the system worked. Would the word Incapacitated written in 1939 have required any further investigation?Or medical authentication. Thanks.