If anything, the US had far too many light AA battalions in serivce during the war. Given that a single battalion has a total of 64 weapons in it (SP half M 15 half M 16 towed half M55 quad .50 and half 40mm bofors) that is quite alot of firepower in a single battalion.
I doubt that given the plaucity of Luftwaffe offensive activities even in North Africa that a great deal of AA units were necessary even there.

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