Pros
You get to build software that helps protect the safety of the U.S. and helps the officers in the field carry out their mission. Incredibly interesting subject matter and business domain. The officers are smart, engaging individuals who were great to work with.
Cons
When the head of the entire agency releases a memo to all employees stating "...federal employee survey results indicate that we have the lowest morale among all federal agencies for the 5th year running. We will no longer be taking feedback regarding morale." you know you have problems and that they will never be taken seriously or resolved. The organization is run like a mafia outfit with tyrannical power pockets, unjust firings, and an atmosphere of suppression and fear that make doing your job done on a day-to-day basis a living hell. Leadership is as politically dysfunctional as it's technology is advanced (for a government agency).