This is a report from the Army Research Institute, and gives a good look at "who makes it" in SFAS. The finding are pretty interesting, although predictable in my opinion.
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA525579&Location=U2&doc=GetTRDoc.pdf
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA525579&Location=U2&doc=GetTRDoc.pdf