Comparing: Panzerjäger I vs. T3 HMC

Development of the Panzerjäger I, the German tank destroyer, started in 1939 based on the Panzerkampfwagen I Ausf. B. Initially, the 37-mm Pak 36 gun was mounted on the chassis of the Panzerkampfwagen I Ausf. B. However, during the invasion of Poland, it was revealed that the gun was not effective against new vehicles. After Germany captured Czechoslovakia in 1940, the 47-mm Pak 36(t) L/43.4 (Škoda 47-mm A-5 KP ÚV vz. 38 Model A5) gun was mounted on the tank destroyer. A total of 202 vehicles were manufactured and saw action until 1943.

Light SPG for infantry and tank support. Developed in 1938 on the M1A3 chassis. Only one prototype was built. The trials demonstrated a number of technical and functional problems, and the vehicle never saw service.