Private Bradley Manning, 25, faces his first day on trial Monday -- accused of the largest leak of classified information in U.S. history -- with prosecutors saying his actions aided the enemy.
His charges stem from providing more than 700,000 documents to WikiLeaks, an international, online, non-profit organization which publishes secret information, news leaks, and classified media from anonymous sources. The leak included a video showing an Apache helicopter kill a group of civilians and two Reuters journalists in Iraq.
Manning, who has already admitted to releasing the information to Wikileaks said the move was intended to spark renewed debate on U.S. military action. "I take full responsibility for my actions," he said at the time. "I felt I accomplished something that would allow me to have a clear conscience." But the government says the leaks damaged national security and endangered American lives. He faces a possible life sentence if convicted.