This - modification of the famous rocket launcher "Katyusha" (nicknamed  "Andrew"),  fired  projectiles of caliber 310 mm (as opposed to the 132-mm shells "Katyusha). It fired 12 rockets (2 rows  of 6 ).  The system was built on the American truck chassis "Studebaker» (Studebaker US6), which was delivered to the USSR under Lend-Lease

rocket launcher BM-31-12 in Berlin 

 BM-31-12  "Katyusha"  on a  American truck chassis "Studebaker",  nickname "Andrew" on the streets of Berlin.  In the background, another rocket launcher. 

May 1945 
Photo: George Ugrinovich 


Stalin Organ

A Soviet Lend Lease Sherman that was converted to a "prime mover."  I'm assuming this means it was used as an APC, something of a rarity in the Red Army.  No further information...
Nick