At Sierra Vista Ranch in Arizona near the Mexican border, Troy McDaniel is warming up his helicopter. McDaniel, tall and slim in a tan jumpsuit, began taking flying lessons in the 80s, and has since logged 2,000 hours in the air. The helicopter, a cosy, two-seater Robinson R22 Alpha is considered a work vehicle and used to monitor the 640-acre ranch, but it’s clear he relishes any opportunity to fly. “We will have no fun at all,” he deadpans.