While it is biologically proven that men and women think differently, they still have the same mental capacities. There is no mental job for police officers or soldiers that a woman shouldn't be able to do. There are, however, many physical differences between men and women that definitely should not be ignored. Men are biologically born stronger in the ways that law enforcement and military need.
I believe, however, that it should not be confined to "men and women," but that standardized tests should be given that both genders have to pass to be able to make it into physically demanding jobs where other peoples lives and freedoms are at stake. Even though men biologically tend to be built stronger, there are definitely women out there who are willing, and very much able to serve law enforcement and military. There are just much fewer of them.