The M36 Jackson is a bigger version of the M10 Wolverine. AT 14 instead of AT 13.
The P47 Thunderbolt, or 'Jug', was the workhorse fighter plane for the US. Today's A10 Tunderbolt was named after it.
You can get the Chaffee in platoons of 3, 4, or 5. and you can run either Confident Trained or Confident Veteran.
They are; front armor 4, side 2, top 1, speed 16" like a stuart, but they have the gun of a sherman, ROF 2, AT 10, FP 3+. and they still have stablizer.
Start with:
HQ: 2x Chaffee
1: 4x Chaffee
2: 4x Chaffee
3: 4x Chaffee
TD: 4x M36 Jackson with security section
AIR: priority P47, or limited if your squeezing points
Suggested add-in would be Armored Mortars and/or cheap recon.