both (the) X and (the) Y

Which of the three alternatives is correct (or recommended)?

1. "in both the military and civil fields";
2. "in both military and civil fields";
3. "in both the military and the civil fields".

(entire sentence: "Current UAV technology has led to an exponential growth in the potential applications of drones in both (the) military and (the) civil fields.")

[update] The intended meaning is "the military field and the civilian field"; the term "field" is intended as synonym of "sector".