In 2003, a survey of female veterans found that 30 percent said they were raped in the military. A 2004 study of veterans who were seeking help for post-traumatic stress disorder found that 71 percent of the women said they were sexually assaulted or raped while serving. And a 1995 study of female veterans of the Gulf and earlier wars, found that 90 percent had been sexually harassed.
This really isn’t surprising. (And note that I don’t say that as a justification for rape. Rape is immoral. It is just as I said, it isn’t surprising.) For one, this is one of the classic reasons why people have traditionally argued against women being in the military: that women shouldn’t be in the military because they will get raped.
A little speculation though… I think the type of cognition that one develops that allows them to kill and murder, and worse (as one would need to wage war) also will tend to allow them to rape. That you cannot have the former without the later.