Retired Air Force Col. Morris Davis testified as a defense witness Tuesday at the soldier's court-martial.
Manning has acknowledged sending nearly 800 Gitmo detainee assessments to the anti-secrecy group in March 2010. Five of the documents are the basis of an espionage charge.
Davis says four of the men named in the briefs had been released from Gitmo years earlier. He says the fifth is on a list to be transferred out.
Davis says the still-classified assessments contain little information that hasn't been publicly released by sources other than WikiLeaks. And he says an enemy would learn nothing of value by reading the briefs.
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