What should you do?
It's nearly July and we've already hired our interns (at least at my facility we have). That the manager whom interviewed you didn't ask you any questions is a bit strange, but depending on what you were interviewed to do, they might not have had the experience to ask you anything of importance (my entry interview had two people involved because the manager interviewing was not experienced in my field).
That said, if you don't hear from someone in about 2-3 weeks, odds are that you never will. That's not just for Lockheed, but for most any company. HR has earned it's reputation for being unnecessarily bureaucratic, but if they want you the gears will turn quickly. More to the point, I've always believed in the saying that you can tell a lot about a company by the way in which they go about hiring you. If they make it a long, drawn out process, then odds are that they're going to be a problem employer for as long as you're there (bureaucracy, lack of support for employees, etc.).
Regardless, my advice to people is to put forth a good interview and then to move on to the next one. To sit around and wait for someone to finally make a decision when it comes to hiring at any company is just a bad call, and an invitation to frustration and disappointment.