FORT MEADE, Md. — Army Pfc. Bradley Manning was sentenced Wednesday to 35 years in prison for giving hundreds of thousands of secret military and diplomatic documents to WikiLeaks in one of the nation’s biggest leak cases since the Pentagon Papers more than a generation ago.

Flanked by his lawyers, Manning, 25, stood at attention and appeared not to react when military judge Col. Denise Lind announced the punishment without explanation during a brief hearing.