The European Convention doesn't mean everyone has a right to serve in the armed forces in any capacity. It simply means that everyone has a right not to be discriminated against. There's a balancing exercise. Clearly it depends on the nature of the job and the individual's capacity, and the extent of their disability. He seems to think that giving jobs to disabled people is a charitable act.
Equal opportunities is about getting the right person for the job.
That is what has held disabled people back for so long. When you join the army you have to go through rigorous training whether you are a cook, whether you are a medic, whether you are a bandsman. There is no scope for making an assault course easy for disabled people. I could never use, so I decided to leave. I do not think he meant anything in any way derogatory to disabled people.