Honestly many of the units realized once they got to the States they would either be sent to Mexico or release from duty. While the vast majority would be left to find their way to where ever home will be in the future. So to some units they were better off and much better shape to stay in place. Also remember around the 4th US Army their were still hostile force on the other side that wouldn't mind filling a void left by the US units leaving...
Just some thought.
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