One of my college professors was involved in the development program for ~4 years, and said it was (one of?) the most stressful experiences of his life.
Major General Craig Olson, he (and his wife) are some of the most caring people I’ve met, I’m sure the weight of managing a program like that was a lot to bear. Looks like he left the program shortly after the March 2006 accident. He presented on some of the engineering challenges they faced and solved in the program (especially failure modes), but my memory is hazy.