ABOARD A ROYAL AIR FORCE TANKER-High in the skies above Nevada, an F-35 jet carefully flies beside a tanker, trying to latch onto the plane to refuel. Three more U.S. Marine Corps F-35s follow, taking on gas on both sides of the Royal Air Force Voyager tanker, followed by six British Typhoons. Then the topped-off jets zoom off to their targets, some 150 miles away.