There was an article recently about a thriving business for ex-military extras. It was specifically about Rogue One and that their use gives a degree of authent

There was an article recently about a thriving business for ex-military extras. It was specifically about Rogue One and that their use gives a degree of authenticity that extra otherwise wouldn't have in terms of how they interact with, or even just sit in a cockpit. The same for the ground combat scenes. Years ago when the BBC made a drama series about a cathedral choir they found it easier to take choristers and teach them to act than to teach actors to sing. Whilst the overall plots or concepts may still be greater than life there are directors that appreciate a bit of underlying accuracy.