VR in the military
VR has been used not only in training military personnel, but also in providing therapy those who suffer from PTSD.
Rizzo, A., T. D. Parsons, B. Lange, P. Kenny, J. G. Buckwalter, B. Rothbaum, J. Difede, J. Frazier, B. Newman, J. Williams, and G. Reger, 2011. "Virtual Reality Goes to War: A Brief Review of the Future of Military Behavioral Healthcare," Journal of Clinical Psychology in Medical Settings 18 (2): 176-187 (doi: 10.1007/s10880-011-9247-2).
While not very technical, great for understanding VR use in military:
More in-depth, but not technical: