All US infantry divisions were identical, at least on paper. They also had non-divisional units attached, such as tank, AAA and additional arty battalions.

Each infantry division was consisted of 3 infantry battalions plus medical, arty, qm battalions and companies, etc. Battalions were numbered 1st, 2nd and 3rd in each divisions. Independent battalions had larger numbers, such as the 100th Infantry Battalion (Nesei)

Each infantry battalion consisted of 3 infantry companies and 1 heavy weapons company, plus HQ platoon.

Each infantry company consisted of 3 platoons and a heavy weapons platoon.

If you have any more questions along these lines that concern the general makeup of a US unit or is you want to discuss your father's service, let me know and I will split the this section of the thread off into another thread so we can get this one back on topic.

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Best Regards,
JW