The US Army division organization were published in TO&E 2 for cavalry divisions, TO&E 7 for infanty divisions, and TO&E 17 for armored divisions. Likewise, the infantry regiment organization was TO&E 7-11, the infantry battalion TO&E 7-15, the infantry company TO&E 7-17. Tallying up the division strength covers a good number of documents, but it's all there.

While the published strength was fixed, in practice they would have various other units attached. An infantry division would often have an anti-aircraft artillery battalion, a cavalry squadron, a tank battalion, an anti-tank battalion, and a field artillery battalion all attached to augment their combat power. They might also detach a regiment to another unit.