GUANTANAMO BAY NAVAL BASE, Cuba -- A war-crimes trial for Guantanamo's youngest detainee opened Thursday with prosecutors showing an al-Qaida video of him making, and apparently planting, bombs in Afghanistan.

Prosecutors and defense lawyers offered competing views of whether Omar Khadr, who was 15 when he was captured in 2002, was capable of acting independently from the Islamic extremist father who took him to Afghanistan.

In the video found in an al-Qaida compound, Khadr showed only the faint beginnings of a mustache. Now a broad-shouldered, full-bearded man of 23, he sat before a military jury charged with crimes including spying, supporting terrorism and murder for allegedly throwing a grenade that killed a U.S. Special Forces soldier.

Khadr has pleaded not guilty to all charges.

Prosecutor Jeff Groharing accused Khadr of embracing terrorist ideology as his own and describing operations against U.S. forces with pride even after his capture.

" 'I am a terrorist trained by al-Qaida.' Those are Omar Khadr's own words," Groharing said, describing one of the detainee's first interrogations at Guantanamo. "Omar Khadr decided to conspire with al-Qaida so he could kill as many Americans as possible."

A Pentagon-appointed defense lawyer said Khadr was a victim himself, pushed into war as an impressionable child by his father, alleged al-Qaida financier Ahmed Said Khadr.

"He was there because his father told him to go there," Army Lt. Col. Jon Jackson said. "He was there because Ahmed Khadr hated his enemies more than he loved his son."

The judge called for a recess after Jackson fell and passed out for several seconds while questioning a witness. He was put into an ambulance outside the courthouse.

The case has been delayed for years by legal wrangling and a series of challenges to the system of war-crimes trials, known as military commissions, that was set up during the Bush administration and has been criticized by human rights groups for not including the same protections as federal courts or traditional courts-martial.

The Khadr trial is now the first under the administration of President Barack Obama, who revised the system to offer more protections to defendants and is considering it as a venue for the prosecution of more prominent suspects, such as alleged 9/11 mastermind Khalid Sheikh Mohammed.

The video introduced as one of the first pieces of evidence was recovered along with bomb-making materials from a compound in eastern Afghanistan where Khadr allegedly threw the grenade that killed Sgt. 1st Class Christopher Speer, 28, of Albuquerque, N.M.

Khadr has denied throwing the grenade.