It would be an interesting awful power to have, but I have to think that such a power would have had more "terror value" against extremely sexist Arab extremists than against random E-4s who are considering leaking some war porn to wikileaks. Why dump Osama in the ocean when you can just convince her she's a woman? All her former allies will reconsider their terrorist activities.

By all accounts, however, Manning's gender issue was present before enlisting, and certainly before she had access to classified materials.