From my professional opinion:
All most all companies tell you that you will hear from them either way. This is not true. Even if they did really like you but are not going to hire you, they still will not make the first move to let you know...they simply don't have time.
Landing a job with them would be a great opportunity for you. E-mailing for feedback is not personal. They may get tons of e-mails a day and don't have time to reply back. My best suggestion would be to call the hiring manager, or whoever gave you the card, and say something like
"Hello sir/ma'am, this is 'so-and-so'. You may or may not remember me, but I had an interview with you at 'such-and-such place' on 'this date'. We were discussing the 'whatever position'. I was wondering if you could provide me with a status. I believe I am a great fit for your corporation and truly believe I had a wonderful meeting with you."
See what they say. They will either say they have filled the position and appreciate your interest, or they have not filled it and are still looking for the right candidate (have more interviews before they hire). If they say they have filled it, your response should be something like
"Well, thank you very much for your time. Like I said before, I really believe I have the skills and personality that would be a great fit for Lockheed. I have filled out the resume database on Lockheed's website and hope to hear back soon regarding other positions I have applied for. Please keep my name in mind for future openings with the 'whatever' position."
Have a good attitude, make them want to talk to you. You really need to speak with them on the phone. Hope this helps!
P.S. If you need any other advice, just let me know your e-mail address and I'll be more than happy to help.