''Bada bing, bada... Boom!''

The ruggedness, simplicity, low cost and effectiveness of the RPG-7 has made it the most widely used grenade launcher in history. More than nine million units have been delivered since it was introduced by the Soviet armed forces in 1961.The RPG-7 has been used in almost all conflicts since the 1960s, from Viet-Nam to Syria.

RPG-7 Soviet Antitank Grenade Launcher manual (U.S. Army, 1976)

https://archive.org/details/milmanual-rpg-7-antitank-grenade-launcher