The first Soviet RPGs were just handheld anti-tank grenades (
Ruchnoy Protivotankovy Granat)
. The RPG-1 was their first attempt at a rocket-propelled anti-tank launcher, but it didn't work very well. The RPG-2 worked and was put to production, but it was a recoilless gun like the Panzerfaust, instead of rocket-propelled. The RPG-7 was their first working rocket-propelled design, and its popularity led to the term "RPG" being used as a generic term for rocket launchers.