A last-minute problem nixed the launch attempt on June 1 of Boeing's first crewed space flight, the latest in a string of delays. Two NASA astronauts were strapped in the company's Starliner capsule when the countdown was automatically halted at 3 minutes and 50 seconds by the computer system that controls the final minutes before liftoff. Technicians can't get to the computers to troubleshoot the problem until the rocket is drained of all its fuel, explained Tory Bruno, CEO for the rocket maker, United Launch Alliance.