FORT MEADE, Md. — The case of a U.S. Army private accused of creating the biggest national security leak in U.S. history adjourned Thursday to wait for a decision on whether Pfc. Bradley Manning will face a court-martial -- and life in prison if found guilty.

Military prosecutors and defence lawyers gave their closing arguments, with prosecutors saying the 19-year-old intelligence analyst defied the nation's trust by pulling more than 700,000 documents from a supposedly secure computer network and giving reams of national secrets to WikiLeaks.

The defence said the Army had failed the troubled young soldier and is piling on charges in an attempt to force him into pleading guilty.

Presiding officer Lt. Col. Paul Almanza now has until Jan. 16 to recommend whether Manning should stand trial for aiding the enemy and 21 other charges. If convicted, he could face life in prison.

"Pfc. Manning gave enemies of the United States unfettered access to these government documents," prosecutor and Capt. Ashden Fein said, pounding the podium.

The defence team says Manning was nearly paralyzed by internal struggles over his belief that he was a woman trapped in a man's body. They say his supervisors failed to suspend his access to classified data despite clear signs of emotional distress, including his statement that he had multiple personalities.

Civilian defence attorney David Coombs called the intelligence division of Manning's battalion a "lawless unit" for allowing soldiers to play music, movies and video games stored on a network meant for classified data.

Manning allegedly downloaded the diplomatic cables onto a rewritable CD labeled "Lady Gaga," while lip-synching her song "Telephone."

Coombs also challenged the government's original decision to classify as "secret" the material WikiLeaks published, arguing that the release of the material had caused no harm.

"If anything, it's helped," he said.

Manning's supporters say the information published by WikiLeaks exposed war crimes and triggered the wave of pro-democracy uprisings in the Middle East.

Manning was charged with giving to WikiLeaks a trove of classified data, including hundreds of thousands of State Department diplomatic cables and raw battlefield reports from Iraq and Afghanistan. There was also video of a laughing U.S. helicopter crew gunning down 11 men, including a Reuters cameraman and his driver, in a clip WikiLeaks called "Collateral Murder."

The reason Manning allegedly gave for the disclosures, in online chats with a confidant who turned him in: "I want people to see the truth."

Adrian Lamo, a one-time convicted hacker, testified he gave investigators records of his May 2010 online chats with a correspondent using the screen name "bradass87" who bragged about engineering "possibly the largest data spillage in American history" from his Army post in Baghdad.

Two computer forensic examiners said they found evidence on Manning's workplace and personal computers that he had downloaded battlefield reports from the military's supposedly secure network and emailed them to WikiLeaks.

Throughout the proceedings, Manning remained outwardly calm while witnesses talked about his emotional problems, his difficulties as a gay soldier during the military's "don't ask, don't tell" era and his violent outbursts while serving in the United States and then in Iraq from late 2009 to mid-2010.