Some of these formations never existed off paper, but what would be really interesting would be to place the emphasis back on fielding a deeper bench of combat formations, even if they are administrative and not fully manned, and less on padding giant functional commands to justify the number of stars on the flag out front. The SecWar's efforts to reduce the number of GOs could play a role in getting Soldiers re-assigned to the types of units we'd need to scale for LSCO.
The Division is the unit size most relevant to studying strategic and operational level of war. Why?
1. It's the smallest unit that can operate independently - has its own staff, engineers, transport, etc.
2. It's the smallest unit that national leaders actually care about.
3. It is the largest unit size that has its own distinct, stable identity. Corps, Armies, etc. are often changed or dissolved, Divisions are usually permanent.
4. It is combined arms. Even an armoured division has plenty of infantry, all divisions have organic artillery, etc.
5. Divisions participate in multiple large scale campaigns and usually have detailed histories. Individual Regiments, Battalions, etc. are often destroyed or rotated out of line, but their Division remains engaged.