Comparing: T18 vs. Panzerjäger I vs. AT-1

Development of this self-propelled gun on the basis of the M3 light tank started in October 1941. The first prototype passed trials in the spring of 1942, but the vehicle never saw mass production.

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.

Experimental self-propelled gun on the T-26 basis. Several vehicles and eight armored hulls were built. Never saw mass production.