Pros
Secure job, one of the largest employers in the area. It's rare to find a place in NH that pays as much as BAE Systems. It's often difficult to get a job in this area of NH, so it's good if you want to live and work in the state.
Cons
Very much a place of favoritism. If you're not one of the "good ones" then you're not going to go anywhere in the company. If one of the favorites does a serious vile act, HR will brush it under the rug to avoid punishment or removal of the problematic employee. This creates a toxic workplace culture as some know that they are untouchable because of this. They need to work on their diversity and acceptance. I am not a minority, but I've had friends who have had traumatic experiences at the NH Locations of BAE Systems. I've worked in other locations for brief periods, and this diversity issue is primarily in NH.