Judge Colonel Denise Lind, who last month convicted him of 20 charges including espionage and theft, could have sentenced him to as many as 90 years in prison, though prosecutors had asked for 60 years.
Manning will be dishonorably discharged from the US military and forfeit some of his pay, Lind said.
A US military court had found Manning, 25, guilty of 20 of the 22 charges of spying and disobeying orders lodged against him for having handed a large quantity of secret military reports and US diplomatic cables to WikiLeaks.
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