Wow, the famous author Adrian Goldsworthy makes a fantastic interviewee, even with a bit eccentric "er". https://youtu.be/O1kfuUltMDE He draws out all kinds of cultural context to soldiering, including what a posh assignment Britain could offer as a whitecollar admin role due to the locals not being literate enough to do that. Gosh they seemed to live long into retirement; I think the supposedly short lifespans should factor out infant deaths.
Another great source is historian Gareth Harney who I cue up talking about the sometimes softer side of Roman slavery, gladiators protected by referees, and the amazing way they showcase the +- possibilities in our culture. He has a fabulous show and tell twitter account at https://twitter.com/search?q=OptimoPrincipi&src=typed_query