Government prosecutors have built a strong eyewitness case against the veteran soldier, with troops recounting how they saw Bales return to the base covered in blood. And in unusual testimony in a military court, Afghan civilians questioned via a video link described the horror of seeing 16 people killed, mostly children, in their villages Law experts say the case could test whether the military, aided by technology, is able to embark on a new era of accountability.

Bales faces 16 counts of premeditated murder and six counts of attempted murder. The preliminary hearing, which began Nov. 5 and is scheduled to end with closing arguments today, will determine whether he faces a court-martial. He could face the death penalty if convicted The U.S. military systems record has shown it is slow to convict service members of alleged war crimes.