While every country should have obligatory military service, not every country should draft every civilian. The number of citizens called up and the length of term should be set solely based on the security needs of the country. The only reason to draft everyone is if the nation cannot meet those needs even with every civilian.

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Con: Even if the security needs of the country are met without requiring all citizens to be a part of the military, there are other areas where community service is needed, such as education, (re)building community spaces and parks and caring for the elderly citizens.

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Con: The security needs of a country can change quickly and dramatically.

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Pro: Keeping people in military/community service longer than their service is needed and used would decrease their motivation and willingness to be hardworking after they return to their everyday jobs.