system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: The draft age should be 21 not 18.

EDIT: I meant age of voluntary enrollment, not draft!

This view comes from the fact that in the United Stated you cannot drink alcohol (or smoke pot) until you are at least 21. The arguments for this policy are 2 fold. First, that your brain is still developing and these activities might impair it's development, and second, that because your brain is not yet fully developed areas that dictate decision making are not yet mature. The effect of this is that people will make choices without considering the consequences, so as a result drugs need to be made illegal as young users could not make a so called 'reasonable' decision about their usage.

What this has to do with the military: 

As it currently stands, you can join the military at 18, an age scientists have agreed that your brain is not yet fully mature. Is it not immoral to allow people who are apt to make impulse decisions to sign their lives away to the government? If the logic that prohibits minors from using substances holds, then it should be evident that 18 is also to young to join the military.
gpt
Are you talking about the draft age as stated in your title? Or the voluntary enlistment age as mentioned in your explanation?

Because the draft is never going to be used by the U.S. except in an emergency situation ever again. Modern equipment and tactics just make unskilled infantry too useless compared to trained volunteers. 

And, by definition, if it's an emergency none of your points really matter. It's an emergency. We're being invaded by huge numbers of foreign troops that somehow make it here without being detected (or aliens or zombies or something). We need warm bodies or our country will be destroyed. 

As for volunteers... the armed forces *do* assess the abilities and maturity of their recruits before accepting them. 

The 21 year drinking age is not embodying a principle that *no* 19-year-olds could drink without harm... it's a line we draw because there's really no mechanism to assess individual capabilities in a liquor store, and because we don't want legal alcohol being given by 18 year old high-school students to even younger ones. 

And also, alcohol is *physiological* affects on maturing brains, not just ones involving judgement and ability to make decisions for yourself.