"As I transition into this next phase of my life, I want everyone to know the real me," the 25-year-old said in a statement read out on NBC's TODAY show in the presence of his lawyer, David Coombs. (Agencies)
"I am Chelsea Manning, I am a female."
"Given the way I feel and have felt since childhood, I want to begin hormone therapy as soon as possible," the statement said.
"I also request that starting today you refer to me by my new name and use the feminine pronoun."
On Wednesday, a military court sentenced Manning to 35 years in jail for handing secret government documents to WikiLeaks, resulting in America's biggest-ever security breach.
Manning will serve his sentence in military custody before being dishonorably discharged. He has spent most of his detention at Fort Leavenworth military base in Kansas where he was expected to serve his time.
After the announcement, Coombs told NBC that Manning has not indicated whether he would be pursuing sex change surgery. "I don't know about the sex reassignment surgery... Chelsea hasn't indicated that that would be her desire, but as far as the hormone therapy, yes," he said. "I'm hoping Fort Leavenworth would do the right thing and provide that."
Coombs added: "I think the ultimate goal is to be comfortable in her skin and to be the person that she's never had the opportunity to be."
"As I transition into this next phase of my life, I want everyone to know the real me," the 25-year-old said in a statement read out on NBC's TODAY show in the presence of his lawyer, David Coombs.