The WTS position on working for the government has to do with what kind of work you do. For example the following are either forbidden, or restricted.
2) Law enforcement/security which requires a gun to be carried
3) Neutrality in political areas such as the State Department, Congress, the President/VP office (for example)
4) Doing research on weapons
5) Being appointed politically rather than competing for the job through civil service
etc, etc, as you can imagine a Talmud of rules can apply.