At the start of the second week of Manning's trial, the court heard that one software program he is said to have downloaded illicitly while stationed in Iraq was used by everyone in the intelligence cell where he worked.
Manning has admitted sending diplomatic cables and battlefield reports from the wars in Iraq and Afghanistan to WikiLeaks but he denies "aiding the enemy," chiefly Al-Qaeda, a charge that could see him jailed for life if convicted.
"Everybody had it" on their computers, Madaras, who held the rank of sergeant when he left the army in January this year, said at Manning's court-martial, which is being held at Fort Meade military base in Maryland.
Asked by Manning's civilian defence lawyer if the program had been banned by army commanders, Madaras replied: "No, sir."
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The slew of charges that Manning faces, 21 in total, includes counts that he breached army regulations by using unauthorised software for unintended purposes and that he circumvented security systems by acting beyond his authority.
The government argued in the first week of the trial that Manning had set out to leak information almost from the start of his deployment -- he arrived in Iraq in November 2009 -- but the defence disputes this.
The court heard today from Special Agent David Shaver, the prosecution's lead forensic examiner, that Manning had probably first searched the Internet in early December 2009 for information about WikiLeaks and Assange.