Guy Ritchie's The Covenant

During the War in Afghanistan, U.S. Army sergeant John Kinley recruits Ahmed to interpret with local Afghans during their mission in Afghanistan. Ahmed agrees in pursuit of revenge against the Taliban for the death of his son. When the soldiers' platoon confronts the Taliban in the desert, they are caught off guard and Kinley is knocked down. Before he can be captured, Ahmed rescues Kinley by dragging him through the desert mountains to avoid the Taliban. Kinley then returns to the United States, but soon learns Ahmed is pursued by the Taliban and is holed up somewhere in Afghanistan. When U.S. authorities refuse to respond, Kinley himself travels back to Afghanistan to rescue the friend who risked his life for a total stranger.