A Calgary reservist is facing a court martial after a blast on a training ground in Afghanistan in 2010 killed one soldier and injured three others.

Major Darryl Watts is charged with manslaughter, negligent performance of a military duty, unlawfully causing bodily harm, and breach of duty.

Major Watts held the rank of Captain and was the Officer in Charge of Practice on February 12, 2010 when a range training incident killed Corporal Joshua Baker, 24, and injured Bombadier Dan Scott, Sergeant Michael Mark McKay, Master Corporal William Pylypow and Corporal Wolfgang Brettner.

Three of those injured soldiers have testified at Mewata Armoury this week.

"It's a war zone. It's not intentional. I don't know what the circumstances are, you know, if I even want to classify it as an accident, but it is combat so it's unfortunate, I don't want that to happen but blame is something outside of that," said Master Corporal Pylypow after Tuesday’s session.

Pylypow was hit in the arm and has since recovered.

He says he thinks justice is being served and that it is a stressful but necessary procedure.

"There's different scenarios out there, I just represent one but I think it's a good process. It's just stressful," said Pylypow.

Watts’ defence attorney, Balfour Der, says he was not adequately trained in the use of the device and he should not be held responsible for what happened.