Hi @dinascherbakova, it's a good question and one we also considered quite a lot! We thought about asking people to choose from a predefined list of genres but as there are so many unusual variations we would inevitably keep encountering new options. That list would quickly grow and we might risk people becoming overly concerned about not choosing the right one.
For the example above, I think it's nice to have the additional detail, so would suggest going with Nautical Drama/Military Drama. We'll probably get both options and this is one of the things we'll have to clean up during post processing. We may well generalise some of these for our final records (we're currently finalising the structure of these records) but if we do generalise we should also be able to find a place for the more detailed terms.