Speaking to the BBC, Manning's friend, the journalist Glenn Greenwald - who was involved in the publication of leaks from Edward Snowden - said she faced a difficult life outside prison.
"She's going to live in a country where the top officials have expressed extreme denunciations of her, condemnations of her, who regard her as a traitor," he said.
"But the reality is that if you look back at what it is that she achieved, she revealed unquestionable war crimes, her disclosures led to reforms around the world."