Mel Gibson’s first film as a director in ten years is “Hacksaw Ridge,” the true story of Desmond Doss, a medic in WWII who showed extraordinary courage and devotion, returning over and over again to rescue 75 wounded men under enemy fire in a battle in Okinawa. I spoke to Gibson, and to Vince Vaughn and Luke Bracey, who play soldiers in the film.

The movie’s battle scenes are intentionally brutal. “I don’t think I glamorized war,” Gibson said. “I made it look hard and hopefully realistic, at least that’s what the Okinawa guys told us. There’s not many of them left but it was an experience for them. I think is not really a war film, it’s a love story because a guy went in there through filial love determined never to kill anyone or harm anyone and he kept putting his life on the line to save lives so this is the greatest act of love you could perform, to sacrifice yourself for someone else so it’s a love story. It just happens to be in the worst place on earth.

Vaughn spoke about the challenge of portraying a the sergeant who trains and then takes into battle Doss and his unit.

I have a lot of military in my family and have done a lot of things throughout the years with the USO, so I had a good point of reference for start. And then being in a unique situation playing a sergeant, that you are training a new unit and that you’re actually going to carry them over to the battlefield, you really are going to feel responsible for these kids. You have got a lot of love for them and your job is ready to prepare them to be able to go to their training and as much as possible not kind of freak out during battle and to stay alive for themselves and for their brothers in arms.

Look, you are preparing for war, so the penalty of not being up to the task is death of yourself or the people in the unit. That’s why I think there is a bit of sense of humor in some of it because you want to reach people. You can’t just come and make them tone deaf because you are screaming at them the whole time. I think like everyone has their own unique way of doing it so I think there are moments when you are really hard, you are trying to get your point across to let them know what’s at stake and your intents. And then there is other times when you try to use it a little bit of a sense of humor to try to get them to laugh and to bring them together. And I think that this presents a unique situation. Here is a gentleman who is refusing to carry a gun. You just have to understand that from a military point of view this is close quarter battles you see the depiction of it in the movie, to be in a foxhole at night, sleeping with somebody and them on watch and someone approaches and they don’t have the means to defend themselves, then obviously no one would want to be in that situation. And I think made the true story and what is so powerful about Desmond is he had such a faith such a conviction and a calling and it really transcended the moment. There is something beautiful in that and I think that when you are true to your convictions and you do stay true to what you believe in, not only are you rewarded but actually everyone else around you is rewarded as well and I think you see that resonate in the film.

Bracey talked about the “intense physical aspect to this stuff especially, the battle scenes. You spend about two months filming that stuff and I think preparation for me it was obviously very physical but not just getting in shape. There is a mental aspect to the physical side in that commitment to everything you are doing. If you take the right attitude towards it you can really tolerate it in a positive way where you can try not to give up and everything you do, you know it’s going to hurt but you know there’s so much left to go as well so I enjoyed that aspect of it, and also just kind of delving into what is a man as well. At what point does a man goes from telling another a man to harden up to the point where can empathize with him.”

Filmmaking technology has changed very rapidly, and Gibson appreciated being able to take advantage of lighter, faster cameras and better special effects.

In the old days you had two stops either way for light but now it’s infinite and you can turn day into night with no problem. You can blow frames up without any loss of quality, you can flop the shot. I mean it’s just crazy what you can do with colors and the color palette. So technologically things really advanced and you can move pretty fast and shoot from the hip but I would say filmwise, in the world of films there are restrictions if you want to make an independent film and this is an independent film. So your budgets are restricted, you have less time to do it. This is a superhero movie so don’t get me wrong, but if he’s not wearing spandex you don’t get the budget.

A lot of things had to come together to make the image happen on screen. The thing with combat or war sequences on screen is it that they have to be clear, so clarity is required but within that wider framework of clarity, almost like a sporting or chess game, you have to have a strategy that is at least readable but it has to look like chaos amidst that. So in order for all the pyrotechnics, and the stunts and bullet hits and the camera guys, the actors, the extras, the stunts guys, everything, a lot of things have to come together so that you can catch it all on the screen so that logistically speaking little bit like juggling a few balls at the same time. But there’s a lot of people doing it. You don’t do these things alone and it’s really about synchronizing the departments, the various departments to come together to really get that image that you want. And after that the special effects that was great afterwards. But the earmark of great special effects is when you can’t see them. You don’t know what the practical stuff is from the stuff that you do afterwards. There’s both — there’s a lot of practical stuff like some 800 shots I think where they are special effects. I mean there’s muzzle flashes and tracers and dirt hits and stuff like that that were put in afterwards that really add so much. So technically speaking it’s a real scheduling juggling match.