Sergeant Christopher Sullivan is on the front lines of the war in Afghanistan. This is his second deployment there. He also did two seven month tours in Iraq. The 25-year-old is on a mission.
"I was a freshmen in high school when they flew the planes into the towers and I-- I wanted to sign up and do my part," he said. "I love my country. I love America, and I love the life I've been given."
Sullivan is now stationed at a small base in southern Afghanistan
Two-and-a-half years ago it was Taliban territory. They controlled the land between the Helmand River all the way down south, but since then the U.S. has increased the number of troops here.
The surge in troops helped drive out most of the Taliban in the area, but the marines there are still vulnerable to the Taliban's most effective weapon.
IEDs are one of the biggest threats to Afghan and U.S. forces
"You see the plume of smoke come up and you knew someone was hit," Sullivan said.
During his last deployment, Sullivan was nearby when an IED killed his best friend.
"Called in his zap number - first letter of the company , first letter of last name and last four of social security number; I heard that and my heart crumbled."
Sullivan says he's prepared to keep fighting the war now 10 years old with no end in sight.
More than two million troops have been deployed to Iraq and Afghanistan in the last decade.