Micro Diorama and US Army Organizational Units

I am planning on creating a diorama to display a collection of C in C 1/285 infantry and several armored units and wanting to create a realistic display. I wanted an idea of how a real Army is organized. I came across the Operational Unit Diagrams on the US Army’s site that I will be useful for my purposes. Click on the organizational units to display a description of each organizational unit(you must have Flash enabled).With the amount of infantry units I am planning on using my diorama will display a platoon worth of infantry.