None of this misogyny rings true for a contemporary fourth-grade boy. Fourth-grade boys in 2013 know better. First-grade boys do. My own son knows that girls can do anything boys can do. It's not even a question.
A possible threat to national security is perhaps more understandable, but getting a prior restraint on a book for national security is near impossible; getting a book banned because people cuss or if the content is "ungodly" (look out Harry Potter books!) is a lot easier.