I believe it goes without saying that you need to have some knowledge, but as we do with civilian juries.... For example, if there are medical issues, you'll make sure that there will be no medical doctor on the panel, just because they have to be informed and all the evidence has to be brought up by the witnesses. So it's the burden of the prosecution to make sure that all the information is given to the panel members so they can render a decision.
There is also one of the dispositions where they're considering that before you can be selected to be a member of the panel you should have been in the forces for at least three years. So does that mean that someone who has less than three years should not be charged with that offence because he's not able to understand what he did? I sort of disagree. But people in the forces learn pretty quickly what they have to do.