Sturmgeschütz III (Introduction) 

Type: tank destroyer

Nationality: Germany

The idea of turretless tanks, specialized in the infantry support was born well before the war. Prototypes appeared already in 1937 on the chassis of a Panzer III B. The concept was tested successfully in the frontline for the first time in France in 1940.
When new Russian tanks appeared on the stage in 1941 (T-34 and KV), they provoked a crisis among the German "Panzerwaffe": they had no vehicule powerful enough to knock out the newcomers at fighting distance. One of the solution adopted was to install a antitank weapon on the Sturmgeschütz and give them a new role: tank killer. They were so successful, that they went on being produced and used on a large scale until the end of the war.
Other designation(s): Sd.Kfz. 142
Based on: Panzer III

 Sturmgeschütz III G Ammunition Carrier 

Type: Ammunition carrier

Nationality: Germany

Ammunition carrier built on a Sturmgeschütz III G
Other designation(s): Munitionträger Sturmgeschütz III G

 Sturmgeschütz III flamethrower 

Type: Flamethrowing tank

Nationality: Germany

In 1943, ten battle-damaged Sturmgeschütz III F/8 were converted into flamethrowing tanks. They were used in Germany only for training until they reverted back to assault gun in January of 1944.
Other designation(s): Flammsturmgeschütz III
Production: 10 units

 SU-122 i 

Type: Self propelled gun

Nationality: USSR

Like the SU-76 i, it is the chassis of a captured German Panzer III, Panzer IV or Sturmgeschütz adapted with an Russian gun. Very few were converted.
Production: 12 units

 SU-76 i 

Type: Self propelled gun

Nationality: USSR

The Russians reused some of the captured chassis of Panzer III, Panzer IV and Sturmgeschütz III by putting their own gun in them.
That new weapon was first tested on the battlefield at Kursk against their ex-owners. Some were later recaptured by the Germans and once again pressed into service on their original side.