The other side of the gate is believed to be home to Taliban and insurgents trying to cross the border, as well as recruiting locations for suicide bombers.
It may sound like mission impossible, but Lt. Col. Bill Clark, commander of Task Force Blackhawk which carries out the assignment, insists it is doable.
"If you look at the border, not every place is trafficable," Clark, 44, told ABC News. "You can't bring vehicles across every piece of the border. So you have to take a look at parts of the border that you can have an impact on, that you can help to deny, to delay, this movement that I'm talking about and focus your efforts there."
"People are creatures of habit, they develop habits of where they go, what times they go and how they do things," Clark added. "Our job is to figure that out and change those."
The American troops work with the Afghan Border Patrol to monitor the region. They also try to work with local villagers. But most Afghans in this region say they care more about fresh water than they do about security issues, despite the Taliban menace.
"A lot of populations up here are under pressure from the Taliban," said Major Mike Saxon. "Sometimes you have to be careful. If they're seen as working too closely with us, they'll be under some threat."
Ideally, the Americans would be able to establish permanent outposts in these village areas, but at the moment, they do not have the troops to do so.
"We just don't have the combat power, the forces to stay there to convince the people that we will be there provide the security for them. Nor does the government of Afghanistan have the forces down here to do that same thing as well. So although we do go out and conduct engagements with village leaders, the border police come out with us, but once we leave, the Taliban are free to come back in and intimidate the villagers."
The alternative to manpower, is technology.
"We need some more unmanned aerial vehicles helping us out flying over and providing surveillance of the border in key areas," said Major Johnson.
Despite President Obama's troop surge and focus on stopping the infiltration from Pakistan, Johnson and his Strykers will be on their own.