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Having twice as many people is a problem. The training system would have to be able to handle twice as many people. Cutting service in half doesn't work quite right either. If training takes 3 months 2 years of service gives you a productive soldier for 21 months but one year only gives you 9 months. Even if you double it to represent the personnel increase you get only 18 months of productive service. You end up with less productive, more expensive people who gain less experience.

It doesn't get better if you keep everything else the same and double the number of people. Payroll costs double and you need to maintain twice as much equipment, housing, supplies, etc.