SD2:BM-31-12 Andryusha

 is a Soviet Artillery unit in Steel Division II.

Background
BM-31-12 was a 12 M-30 rocket tubes mounted on a Studebekker US6 U3 truck. M-30 rocket was developed in 1942 based on the smaller M-13 rocket.

These were used in Guards Mortar Regiments.