Ventajas
So many cool projects, so little time! Honest, if you can find a good manager who can keep you in charge numbers for projects that interest you, you will never be bored. And it's not all missiles and airplanes and shoot-em-out-of-the-sky stuff. You can hold your head high no matter what your politics are. You can be as intellectually challenged as you want to be.
Desventajas
After a while the paperwork/time accounting starts to get to you. And lately it's getting harder and harder to find the magic charge numbers to justify your existence. Did I mention ethics training? The buildings (in the Bay Area, anyway) are drab and the people dress to match them! Women are few and far between, BTW. But on the flip side, the're wicked smaht :-)