What was Milton Friedman's argument for a volunteer army instead of a military draft?

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Milton Friedman argued that a volunteer army would be more cost-effective than a military draft because the opportunity cost of drafted soldiers was much higher than the paychecks of a volunteer army. The opportunity cost of a drafted soldier includes the value of their lost civilian production, whereas the value provided by a volunteer soldier is more comparable to the cost of their paycheck alone. Therefore, Friedman's argument was that a volunteer army would be a more fiscally responsible approach to military staffing.

What Was Milton Friedman's Argument for a Volunteer Army Instead