Vantaggi
Big company, and not supporting of their veterans (I know they have laid off disabled veterans before laying off others at the same skill level). It really depends where you work; If you work onsite with a customer, it's much more stressful and reactionary, if you work at a satellite, it's not as bad.
Svantaggi
Being a big company and contracting for the government doesn't give NG any advantage over the smaller, non-profit, disabled, woman owned companies, etc.. It doesn't matter how good you do on the contract...the lowest bid will always win now. The annual performance reviews only allow a small portion of people to be excellent or out-performing. It doesn't matter how good you are and what your manager rates you at, you still can get kicked down to the "Successful Performer". Pay increases are reflected in that as well.