It's had it's strong points, to be sure. But consider that the British have had to practically abandon some historic single battalion "regiments" in favor of "super-regiments" of several battalions each. That's verging on something really close to brigade districts, except the British don't brigade the battalions together tactically.
I think a plan with brigade districts - something closer to the old German divisional districts, instead of the British regimental system - would be a better option for the US if you want to go with regional recruiting and staying with a unit for an entire career.
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