My first interview was on-campus, following our college career fair. This interview was pretty low-stress, with some basic behavioral questions and a discussion of my resume.
After this interview I was contacted via email for an on-site interview where I would be working. The invite included options for travel and hotel reimbursement, and was very specific in details. I had a brief email exchange with the recruiter that sent the invite, who was very prompt and answered all of my questions.
On the day of the interview I arrived at a conference room with a small breakfast buffet and prepared presentation. I was able to talk with some of the current interns before the recruiter made an informational presentation about Lockheed Martin's business practices and divisions. Then each of the applicants was sent for three rounds of interviews with different hiring managers, each interview taking about 15 minutes.
The questions seemed pretty ordinary, talking about strengths and weaknesses, different experiences (many from my resume), and my engineering methods. It felt like a good discussion, and I learned a great deal about the company's inner workings and management styles while presenting myself. The recruiters were definitely pleased to answer the questions that I had prepared. The people were friendly to talk to, all seemed to have conviction about the line of work they were in, and I was repeatedly reminded of how much the corporation values ethics.
After the interviews there remained some time for discussion, where I was able to talk more with the interns who worked there. They all had done meaningful work and seemed proud of what they accomplished.
On the whole, the interviewing experience was very professional and informative, and I was excited to work with the company as I left. I received an offer about a week later. Unfortunately, about two weeks before the semester was set to end I was contacted and told that funding had been cut for my program, and the company couldn't hire me for the internship. The recruiter that I was contacted by expressed a desire to honor the offer that had been made, and I was able to later secure an alternative position.