There are a couple of things that come to mind. At least one of them has been mentioned already. One of our big lessons learned there was the importance of the leadership's role, the role of the chain of command, in dealing with mental health issues. When the leadership supported the person and, even more importantly, told the member, “I expect you to have a couple of days of rest, and after that, I'm expecting you to be fit again”, it was amazing how important that sense of expectation from their leadership was.
One of things we learned quickly in Afghanistan, as the mental health team, was to really engage leadership and really do training with the chain of the command about how to handle people who came in with what we were calling combat stress response. We weren't calling it PTSD, and most of these people did not go on to develop PTSD. They would get a bit nervous. They hadn't slept for several days. Leadership really took on the role, often with the help of the medical technicians, of dealing with that. That was one thing.
The other thing was how much mental health needs to be integrated into all the medical services. The best example of that was the casualty management teams we set up for people when they came home. We made mental health part of that right from the beginning. It was very important.