Good for her and I wish her all that can be hoped for in her transition in very difficult circumstances.
Personal politics aside, she has done a great thing for humanity, and that is far more important than her gender.
Of course, knowing how military/spook logic works, I can see this going badly within the military. Simplistic and stupid logic, which is what people use when faced with actions and choices outside the 'norm'. "Manning leaked documents. Manning is transgender. Transgender is 'weird and/or evil'. Therefore, distrust/marginalize all transgender people..."
I hate that kind of thinking, but I can guarantee there are legions of assholes who are climbing directly onto that idiot logic train.