"I understand that this is very emotional for people -- especially people in the armed forces," Refsdal told Cooper. "I'm a journalist, I just film what happened."

The war has become "routine" for this band of Taliban fighters, said Refsdal. "They do an ambush and then spend the rest of the day sitting around gossiping on the radio. They sit, they drink a lot of tea and they have some games they are playing."

One of the games is a simple rock throwing contest. Standing in a relatively flat clearing, the men square off to see who can throw heavy rocks the farthest. Most use a two-handed thrust-from-the-chest technique.