Three days before leaving office in January, then-president Obama slashed Manning's sentence by 28 years after more than 115,000 people signed a petition calling for her release.
"I hope to take the lessons that I have learned, the love that I have been given, and the hope that I have to work toward making life better for others", she added, giving thanks for her upcoming release.The White House has said her sentence would end on May 17.
In December 2016, the ACLU and more than a dozen LGBT groups sent a letter to President Obama urging the commutation of Manning's sentence.
Chelsea Manning - the Army intelligence soldier who vaulted Wikileaks to notoriety after leaking nearly three-quarters of a million classified USA war reports and diplomatic cables to the stateless website - will be released from the military prison at Ft.
Congressional Republicans criticized the commutation as a unsafe precedent.Manning, formerly known as U.S. Army Private First Class Bradley Manning, was born male but revealed after being convicted of espionage that she identifies as a woman. She was known as Bradley Manning before transitioning in prison.
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She confirmed the release was going ahead on her Twitter feed on Tuesday. "I can imagine surviving and living as the person who I am and finally be in the outside world". Freedom used to be something that I dreamed of but never allowed myself to fully imagine.
Manning was convicted in a military court martial of 20 counts, including six Espionage Act violations, theft and computer fraud.
The leaks, some of the largest in American history, were embarrassing to officials in Washington and US embassies overseas - and a powerful window into how the United States waged diplomacy and war after September 11.
But critics said the leaks endangered information sources, prompting the State Department to help some of those people move to protect their safety. "It has been far too long, too severe, too draconian", Manning's attorneys, Nancy Hollander and Vincent Ward, said in a joint statement.
Several ambassadors were recalled, expelled or reassigned because of embarrassing disclosures. "Chelsea Manning has served a tough prison sentence". "Now it's here! You kept me alive 3", Manning wrote, linking to a longer statement which referred to some of the treatment she had received behind bars, including "periods of solitary confinement, and. routinely forced haircuts".
At a sentencing hearing, Manning apologised for "hurting the US" and said she had thought she could "change the world for the better".