My good friend neighbor was a Korean - Vietnam Veterian, he flew Sabre JET in Korea, F-4 in Vietnam. Then moved on to the B-47. He said that was the hardest plane to fly. Every time he did a air to air refuel in the B - 47 it scare the hell out of him. He said after every mission that involved refueling, he was shaken. Apprently the hardest part was control the B-47 to not crash into the refueling jet. B-47 did not have a great safety record. I actully got to go out in a KC-135 twice when they were refueling SR-71's the Blackbirds. Intresting experence, did not realized how dangerious this was until someone explained how the process work right.