Misunderstanding the different brain chemistry of youth and their ability to make informed judgement;
Violating US labor law unless you make wildly different structures for them;
Undermining everything from combat effectiveness (for example, studies show mid/late twenties is best age for modern infantry) to unit cohesion (only the aged part of the force can deploy while the pre-18 year olds cannot, unless you want to commit a war crime by making them),
Destroying the day to day lives of the poor drill instructors and commanders of these teens' first unit;
Jeopardizing the way parents and the broader public think about the military and its currently unique status as trusted institution.
But since the rationale for the proposal really just boiled down to the observation that 13 year olds are, as the article wrote, "30 percent cheaper" to target with web ads than 18 year olds, it's really not worth writing hundreds of more words on it.
Peter Warren Singer is strategist and senior fellow at the New America think tank in Washington, D.C., and author of multiple books, including Ghost Fleet, LikeWar, and, pertinent to this topic, Children at War.
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