There are school bus routes, baseball diamonds and American football fields. Soldiers queue for lunch at Taco Bell, Pizza Hut and Arby’s outlets. A postbox stamped with the logo of the US postal service stands outside the commissary stocked with American groceries. The signage is all in English and the US dollar is the currency in use.Beyond the perimeter fence, military helicopters rise above the airfield and cut across the blue sky.The scene is a slice of contemporary America, despite being more than 5,000km from the US mainland.Camp Humphreys, located in the South Korean city of Pyeongtaek, is the largest…