I'll give you a question, please answer with step-by-step reasoning process. People using a machine gun are a part of what?
Options:
- quake 2
- arsenal
- in a
- armory
- military service

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Only military people are given machine guns to serve country. Militiray services have many guns including machine guns.
The answer: military service.