"November 28th, 1945
To the Chief of the Main Artillery Directorate of the Red Army, comrade N.D. Yakovlev
People's Commissar of Armament comrade D.F. Ustinov
People's Commissar of Ammunition comrade B.L. Vannikov
Commander of Armoured and Motorized Forces comrade Ya.N. Fedorenko
RE: GAU letter #945369s dated November 22nd, 1945
I report that the Kirov factory produced an IS SPG equipped with an ammunition rack for single piece ammunition. This SPG will be sent to the GBTU proving grounds at Kubinka shortly.
At the same time, work was also conducted to place single piece ammunition in the IS-3 tank. It was not possible to achieve any kind of satisfactory results in this to date.
Only the SPG with ammunition racks for single piece rounds will be sent to trials.
People's Commissar of Transport Machinebuilding, V. Malyshev"