Spielman took the stand to petition jurors for leniency before he was sentenced.
"I don't really blame my chain of command. I don't really blame anybody," he said quietly. "I could have stopped it. I take responsibility for my actions."
Spielman, 23, of Chambersburg, Pa., received the longest sentence of four soldiers who have been convicted. Three other soldiers pleaded guilty under agreements with prosecutors for their roles in the assault and were given sentences ranging from five to 100 years.