That's probably what a lot of the National Guard Separate Infantry and Armor Brigades would have been really doing in the Twilight War, rather than being brigaded into various units like 44th Armored Division. Or at least serving as Corps or higher assets to be flexed to support any number of operations, be it plussing up a division in the defense or offense on a critical sector to relieving units in place so they could reconstitute.
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