Lockheed Martin Software Engineer interview questions

Mass applied to many positions online. Received request for interview several months later after it seems a recruiter came across my resume. Strangely, I was asked to do a security pre-screen before the actual interview. A few days later, I got an onsite interview. I met with two groups that were interested in me. The interview with the first group was great and the recruiter, or whoever set up the interview, did a really good job matching my technical interests and personality type to the group technical lead and the project. After a solid 45 minute interview in which we mostly geeked out about mathematical projects or object oriented programming, we shook hands and proceeded about our ways. The interview was fairly informal without a lot of the typical interview questions. The hiring manager was very interested and involved in the process and followed up with me several times following the interview concerning how I thought it went and how my interview compared with the group after me. They really seemed quite enthusiastic about Lockheed and the project and that enthusiasm was infectious. Three business days later I received a formal job offer.