Lockheed Martin has a better than average benefit package and also has federal holidays as off days. The Fort Worth site also works on a 9/80 schedule so every other Friday is an off day. Salaried personnel are also paid overtime.
Cons
Lockheed Martin is a very large corporation and has all the bureaucratic tendencies associated with that.
Very relaxed work schedule
Plenty of vacation
You get to work around airplanes
Cons
The job is not technically challenging, the technology moves very slow here.
The company is very top heavy and provides very little opportunity for open competition for available positions to move up.
Salaries are not competitive with the industry
Good salary growth in early career
Interesting work
Stable company
Cons
Long hours on thankless tasks
Stagnant/nonexistent salary growth mid career (in a recession, so take with a grain of salt)
Disconnected management (i.e. you have no idea what they're doing or why)