Okay. Here's is what I'm claiming for my starting position.
As the years progressed, dumbasses in government continued to drawdown the armed forces. The Army horribly atrophied. Eventually, the American Army only had three primary forces.
7th Army is descended directly from the III Corp. It is made up of five primary units, all much decreased from their previously powerful selves. Effectively, it's an enhanced Corp with 5 divisions.
1st Armored Division (Old Ironsides). Primary fighting arm of the 7th. Made up of 4 brigades of aging M1A2 Abrams. They are all equipped with TUSK (Tank-Urban Survival Kit) enhancement and have superbly trained men.
1st Cavalry Division (First Team or Pegasuses). Slightly lighter and faster than Ironsides. The Cavalry is also made up of 4 brigades of armor. However, it's brigades are made up of a combination of M2 Bradley IFV's, M1 Abrams, and M3 Bradley scouting vehicles.
1st Infantry Division (Big Red One). Four brigades, two of a mix of Cavalry, Armor, and Infantry. Two with Infantry and Cavalry.
4th Infantry Division (Ivy or Iron Horse). Three brigades of a CAI mix, One with Cavalry and Infantry.
34th Infantry Division (Red Bull). Primarily a Guard unit, the 34th is made up of four brigades, all based in different states. One is a CAI, two are all cavalry, one is CII.
"Well, get everyone moving. We're hitting Huston with everything we can get there. T80's are nothing compared to an Abrams. The Counterattack Corp moves once again."