Otherwise, you're probably going to get burned out by the constant braying of naive idealists that believe foreign policy exists in a vacuum that conscience moves rather than context.
Should? That probably depends on your personality and skill sets. It's nothing like the movies. If a movie motivated you, that would be the wrong reason.
On a side note, many people in the tech industry indirectly work for them. Many are not even aware. There is more money on the civilian side of things anyway. If you are already in the tech industry, look at the businesses funded by In-Q-Tel. [2] That list is not all inclusive. There are thousands of companies missing from the list.