Northrop Grumman Principal Engineer Mechanical interview questions

A recruiter from NGC emailed me approximately 2 weeks after I applied stating that I got an in person interview scheduled for the next week. The interviewers were very nice about rescheduling the day. A couple hours before the interview, one of the managers called me and gave me instructions with how to check in through security. Since I got there 30 minutes early, that same manager gave me a tour through their small museums at the Redondo Beach site. After that I walked with the manager to the next building and was interviewed by 4 managers. It was a very relaxed environment. The interviewers mostly asked about my past job and school experience. After the interview, the interviewers took me up to see the James Webb Telescope.