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The important thing, however, was to create a way to refuel, there had been a lot of experiments up to this point with aerial refueling, but there really was no way to modify a Cessna 172 to be refueled in midair. So they set up an extra tank that could be filled from a truck on the ground. When they needed to refuel, they would come down and fly very low and just above stall speed, then the truck came along and winched up a hose and then used a pump to transfer the fuel into the airplane. It really was a dramatic show of airmanship, because they had to do it at night sometimes and that required some precision flying.