Chelsea Manning, who confessed to disclosing archives of secret diplomatic and military documents to WikiLeaks in 2010 and has been incarcerated longer than any other convicted leaker in American history, has formally petitioned President Obama to reduce the remainder of her 35-year sentence to the more than six years she has already served.

In a statement accompanying her petition, a copy of which her lawyer provided to The New York Times, Ms. Manning again said she took “full and complete responsibility” for her actions, which she called “wrong.” She also described her difficult life, including the turmoil she faced at the time of her leaks as she came to grips with gender dysphoria while deployed to Iraq, her treatment in prison, and her multiple suicide attempts.

“I am not asking for a pardon of my conviction,” she wrote. “I understand that the various collateral consequences of the court-martial conviction will stay on my record forever. The sole relief I am asking for is to be released from military prison after serving six years of confinement as a person who did not intend to harm the interests of the United States or harm any service members.”

Ms. Manning’s petition was accompanied by letters of support from Daniel Ellsberg, who is famous for leaking a classified history of the Vietnam War known as the Pentagon Papers; Morris Davis, a former military commissions chief prosecutor; and Glenn Greenwald, a legal commentator and journalist who has been an outspoken supporter.