Military prosecutors are appealing the sentence received by a Calgary reservist who was convicted earlier this year for negligence in connection to a deadly training accident in Afghanistan.

Darryl Watts was found guilty of unlawfully causing bodily harm and negligent performance of duty when an explosive device killed 24-year-old Cpl. Josh Baker at a training range north of Kandahar city in February 2010.

Watts, who was the platoon commander at the time, received a severe reprimand and demotion from major to lieutenant, but no jail time.

The prosecution claims that sentence was too light.

"I guess the easy way to describe it is that the Crown will be asking the Court Martial Appeal Court to substitute a greater punishment in the case," said military prosecutor Maj. Anthony Tamburro.

Watts has also filed appeals of both his conviction and sentence.

His lawyer, Balfour Der, said he’s not surprised the military is also appealing.

"You know, they have pursued it vigorously," he said.

"We both recognized it was a possibility that the prosecution could appeal either his acquittal from some of the charges or the sentence. And they’ve chosen to appeal the sentence only … that part of it at least is good for us.

No date has been set yet for the Court Martial Appeal Court of Canada to hear the appeals.