In 1934 the Rock Island Arsenal built prototypes of the T2E1 as an improved T1E4 with a new aircraft engine, which was a series of experimental tanks. This resulted in The US T5 Combat Car.

The US T5 Combat Car Spec’s

Armaments: x4 7.62mm Machine Guns
Armour: 16mm steel
Crew: 4
Dimension: Length 4.43m / Width 2.40m / Height 2.26m
Weight: 8.46 tonne
Engine: Continental W670-7 250hp petrol
Top Road Speed: 58km/h
Operational Range: 180km