True, she has earned the right to do whatever she wants to her body, considering she served in the Navy for 20 years protecting that right for everyone else.
However, she also wrote a book about it. We don't know what the book is about. She clearly wrote it for publicity, using her service as a SEAL for shock value. Let's face it -- this wouldn't make headlines if it said "Retail store manager writes memoirs about sex change operation."
If the book's theme is about how she was oppressed for over 20 years as a woman in a man's body just so she can continue her career as a SEAL, it can make some bad waves for the Navy and is poor form.