Devotion has always defined Steve McCurry. In 1978, when he was just 27, he left his suburban Pennsylvania home for India, with nothing but a rucksack and a camera. He was going to document the overlooked populations of Asia.

A year later, wearing the traditional perahan tunban of the mujahideen, he crossed into rebel-controlled Afghanistan. It was 1979 and the Soviet invasion was imminent. McCurry grew out his beard and sewed rolls of film into his clothes. “As soon as I crossed the border,” he said at the time, “I encountered about 40 houses and a few schools that were just bombed out.” The photos he took, the first to illuminate the brutality of the invasion, kick-started his career and won the Robert Capa Gold Medal Award.