The name BM-13 was only allowed into secret documents in 1942, and remained classified until after the war. Kostikov, the head of the RNII, the Reactive Scientific Research Institute, and finally classed as Guards Mortars.

They were called by code names such as Kostikov guns, after A. Initially, concerns for secrecy kept the military designation of the Katyushas from being known by the soldiers who operated them. Today, the nickname Katyusha is also applied to newer truck-mounted post-Soviet – in addition to non-Soviet – multiple-rocket launchers, notably the common BM-21 Grad and its derivatives. Katyusha weapons of World War II included the BM-13 launcher, light BM-8, and heavy BM-31. This mobility gave the Katyusha, and other self-propelled artillery, another advantage: being able to deliver a large blow all at once, and then move before being located and attacked with counter-battery fire.

The Katyushas of World War II, the first self-propelled artillery mass-produced by the Soviet Union, were usually mounted on ordinary trucks. They are fragile compared to artillery guns, but are cheap, easy to produce, and usable on almost any chassis. Multiple rocket launchers such as these deliver explosives to a target area more intensively than conventional artillery, but with lower accuracy and requiring a longer time to reload. The Katyusha (Russian: Катю́ша, IPA: i) is a type of rocket artillery first built and fielded by the Soviet Union in World War II.

Saudi Arabian-led intervention in YemenīM-13, BM-8, BM-31, BM-14, BM-21 Grad, BM-24, BM-25, BM-27 Uragan, BM-30 Smerch.

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