You always try and make a film that is a letter that will be read and we are so glad that it is being read by the right people in the right place and is inspiring change. It is also gratifying that the survivors are finding it healing and transformative. That's been really great.

Make sure it is not too diverse or spread out so people don't know where to go or what to do. So keep a sharp focus. It can be ambitious but should have a small agenda.

The difficulty is the levels of secrecy we had to maintain around the project at all different times. We had to keep it a secret while making it so we could move under the radar so we could get the stories. Before it came out we had to keep it on lock down to protect the safety and security of some people who appear in the film.

One of the top challenges is the fact that you are dealing with survivors. Every time you deal with a documentary film subject it is fraught with obvious minefields but when you are dealing with a population that is severely traumatized and trying to recover from that trauma there is an extra level of vigilance and care and attention that has to be implemented all the time at every level.

It doesn't happen often, it's what you dream and hope for. We are happy, but we want to make sure these changes have teeth. What we want to get across most is that this is a real opportunity for the military. They can step up and be a leader on misogyny and gender issues.

Whenever I spoke with anybody who said they did not have a problem in the military it was because their commander treated them well. Every single time it was about the commander as to whether they had a good or bad experience.

Figure out the one solution - not three - that you want to see happen. There were quite a few things we could have gone after but we decided to focus on the commanders and that was a strategic decision because that, for us, would be the most vulnerable point and the most effective one that could immediately change.