BAGHDAD — Staff Sgt. David Safstrom does not regret his previous tours in Iraq, not even a difficult second stint when two comrades were killed while trying to capture insurgents.

“In Mosul, in 2003, it felt like we were making the city a better place,” he said. “There was no sectarian violence, Saddam was gone, we were tracking down the bad guys. It felt awesome.”

But now on his third deployment in Iraq, he is no longer a believer in the mission. The pivotal moment came, he says, this past February when soldiers killed a man setting a roadside bomb. When they searched the bomber’s body, they found identification showing him to be a sergeant in the Iraqi Army.

“I thought, ‘What are we doing here? Why are we still here?’ ” said Sergeant Safstrom, a member of Delta Company of the First Battalion, 325th Airborne Infantry, 82nd Airborne Division. “We’re helping guys that are trying to kill us. We help them in the day. They turn around at night and try to kill us.”