Question

If you were a specialist working for the National Security Agency, your main job would likely be

Answer 1

Your main job would be electronic surveillance.
The national security Agency (the NSA) is a part of defense department whose main duty is to do Global monitoring of information for foreign intelligence and counterintelligence decision making purposes, 
To do this, most of NSA specialist will focus on Electronic surveillance rather than having to go to the field

Answer 2

Electronic surveillance, analyzing and breaking coded messages, working in the field to out covert operations, analyzing data from spy satellites<span />