Time magazine has an account of the rescue of the fourth Navy Seal in Afghanistan:
A crackle in the brush. That's the sound the Afghan herder recalls hearing as he walked alone through a pine forest last month. When he looked up, he saw an American commando, his legs and shoulder bloodied. The commando pointed his gun at the Afghan. "Maybe he thought I was a Taliban," says the shepherd, Gulab. "I remembered hearing that if an American sticks up his thumb, it is a friendly gesture. So that's what I did." To make sure the message was clear, Gulab lifted his tunic to show the American he wasn't hiding a weapon. He then propped up the wounded commando, and together the pair hobbled down the steep mountain trail to Sabari-Minah, a cluster of adobe-and-wood homes--crossing, for the time being, to safety.
The whole story can be read here.