Pros
Lockheed Martin has a lot of opportunities across the United States. If you are willing to move, you will more than likely find a position within the corporation. The benefits are better than a lot of other companies.
Cons
Personal development and growth can be stunted by either staying in a position too long and/or not being diverse enough. Managers within Lockheed Martin are to have a diverse understanding on a range of disciplines, but leaving a role for another discipline could result in not be able to return to your discipline of choice. (For example: leaving Systems Engineering for Configuration Management or Information Technology) And on the other end, managers seem to have a stove pipe mentality, when it comes to their personnel, as they want people to be groomed in one particular discipline. But to become a manager, you need to have more knowledge and experience than what the current discipline can offer. The review rating system needs to be revamped. Managers are forced to pass out one low or below average rating, forced to pass out very few (one or two) higher ratings, and groups everyone else in the "average" pool.