where the generals and officials from Pentagon gathered to access the progress of the program, in an auditorium full of people, about 200s, including vendors and customers. Before the demo, the system I&T team worked 24/7, and night before, almost no one went home. However, the system was still very unstable. Someone in the team joked about setting to "fake" it, the chief architect said "no, it is okay if it doesn't work, people knows it is difficult, but we can't fake it." At the review, right before the demo, the program manager asked me if everything was okay, I said yes. He started to talk about the progress we made, and tried to demo to the audience. As you expected, it didn't work. I gathered a couple guys rolled the equipment back to the I&T lab, reset it, and tried again, it worked this time. For unknown reason.

We did get the second chance to do the demo afternoon that day. So it is really not that uncommon for program like J-20.