In my experience, the best way to help people get to a healthy state of mind is to make sure that they are meeting all their basic needs for physical and emotional and intellectual health. When people have the basic needs met they will be able to make good deciscions and will be naturally motivated to try to be a compassionate and productive part of this world. Making sure that people have enough nutritious food (fresh whole foods, and not junk food!), clean air, plenty of clean water, a safe home, exercise and rest, fun/play, love, a sense of belonging, usefulness, and effectiveness (knowledge and skills) will provide them with a good solid base for being a good person, and living a healthy life.
And that goes for everyone, not just scared and confused soldiers.