2. Basically any diagnosis of a mental health condition, like ADHD, will block military service. This is true even if symptoms are well managed without medication. The rise of diagnosis of these conditions combined with digital records means a lot of people are prohibited to join due to mental health that would have been overlooked in previous decades.
3. This serves as the official excuse for why recruitment numbers are down. IMO recruitment numbers are down because Iraq/Afghanistan was such a shitshow.