It's not just Marines, this applies to all branches.
It's the "small $h!t" that matters. Because if you can pay attention to even the smallest detail, you can typically handle the big ones.
That is why we folded our tees and underwear into 6 inch squares with hangars 2 inches apart, etc.
If you can't do that correctly, why should I hand you a toolbox and have you go work on a $100M airplane?
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