Bradley Manning released a statement to NBC News in which the former soldier requested to be known as Chelsea and to be referred to with the feminine pronoun:
As I transition into this next phase of my life, I want everyone to know the real me. I am Chelsea Manning. I am a female.
Given the way that I feel, and have felt since childhood, I want to begin hormone therapy as soon as possible. I hope that you will support me in this transition.
I also request that, starting today, you refer to me by my new name and use the feminine pronoun (except in official mail to the confinement facility).
I look forward to receiving letters from supporters and having the opportunity to write back.
More top news
Thousands of women's rights campaigners have held a rally outside Downing Street.
Hundreds of people are visiting St Joseph's Church in Limerick to pay tribute at the church wake for Dolores O'Riordan.
Ukip leader Henry Bolton faces a vote of no confidence but tells ITV News' Robert Peston the party could crumble if he is forced to quit.