As the Services get smaller and smaller so there is more brainscope for knowing more about less
When I joined the RAF it had over 100,000 more personnel than it will end up with soon. There were more aircraft types in service than we have sqns now. There were bases all around the world in many places most people had never heard of. There were more RAF 'Air Forces' than we have groups now. I answer the same number of questions means the question base would be correspondingly broad but consequently shallow.
The RN also has a unique situation was you would both work and play in a very confined space often for weeks or months on end. You must both fit in with and have something to contribute to the social life onboard as well as purely professional knowledge.