I've been contacted by Lockheed recruiters multiple times, but with the exception of this particular interview it had never gone anywhere. This time they forwarded my information to a hiring manager, who gave me a phone screen and detailed the position.
During the phone screen, while technical topics were discussed, there was no 'quiz show' factor. It was very conversational and cordial. I was invited for an in person interview, which lasted two or three hours. There I met with some managers and potential teammates. The interview was pleasant and the work sounded interesting. Everyone seemed very nice.