Doug McCleve has been monitoring a road block in dry and dusty southern Utah about 19 hours a day for the past three days.

He has stopped every car, inspected it and tried politely to tell the driver to turn back and find an alternate route.He is tired. Hot. And on Saturday, he was supposed to be with his wife and two children attending his nephew's wedding in Salt Lake City.

He didn't volunteer for this job, but he would have.

"To me, there is a sense of duty and responsibility in being here," he said from the rare comfort of an air-conditioned patrol car Saturday. "Do I want to go home? Sure. I'm not going to say I don't. Every officer here would much rather be home. But we need to get these guys; they killed one of our own."

McCleve, 37, is a trooper with the Utah State Highway Patrol in Kanab. Helping with the effort to find and arrest the two men suspected of killing a Colorado police officer and wounding three others is just part of the job.

More than 300 officers from Colorado, Utah, New Mexico and Arizona have been in the Four Corners area over the past nine days assisting in the search. Those numbers include officers from the Salt Lake County Sheriff's Office, West Valley City Police and the Salt Lake UHP unit.

Many have covered countless square miles of rough and rocky high desert terrain on foot and have crawled through bushes and brush along the San Juan River bottoms. Some, left on high bluffs by helicopters, have slept on rocks under the open sky. Others have bodies covered with bug bites from working along the river.

Still others have seemingly less glamorous duty - like manning a road block - but the job is equally important and equally demanding both physically and mentally.

"Have you ever worn a bullet-proof vest," McCleve asks. "On a day like today, it's hot. It's taking a Kevlar blanket and wrapping it around yourself to stand in the sun."

The long hours also make it tough to stay mentally sharp. But any slip, could be a fatal mistake.

"You never know. You have car after car come through here and that one time you let your guard down you'll pop the trunk and there they'll be lying there with a shotgun," he said.

For McCleve, the purpose of the job over-rides any fatigue or sense of frustration.

"It's our sworn duty. That means something to me. We're here to protect the public," he said. "But also, it becomes very emotional for me when a fellow officer has been shot or killed."

That emotion in McCleve's sense of duty will keep him on the job near Bluff as long as he's needed.

"I think every officer out here would say that," he said. "We want these guys out of the community."