Let's also remember that the American military model at this time called for a massive call-up of state volunteer units (which had happened during the Spanish-American War...with the attendant problems). The Army had always trained (when it trained at all) for large-scale conflicts. The biggest training flaw had always been the small size of the Army, which dictated the two-company posts.
In response to Bob's post...the industrial base had cranked up to a degree to deal with munitions orders and small arms, but things like mass-producing aircraft engines (Liberty engine, anyone?) were well behind that in terms of scale.
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