Get the salary up-front because the increases are small (1% - 4%)unless you have a top security clearance. Even then, they are still only 5 - 8%. For once, I agree with lockheedhack. Don't lie about your salary and you need to disclose it. Lockheed hires some joke of a company to check your salary. They ask your past employer for "ranges" instead of an actual number so if you inflate, only do it by a little bit. Again, I strongly suggest you be honest.
Lockheed tries to keep everyone around the medium for the given salary bands. The bands also overlap and are adjusted per region. Someone in the Washington Metropolitan Area or Sunnyvale, California will usually make more than someone in Orlando, Florida or Valley Forge, PA due to cost of living factors.
The best thing to do it get a salary in a top market and then move to a small market like Owego, NY. That way, you have a top salary in a low cost of living market. I've seen many people do this. It seems to be the norm rather than the exception.