The RPG-2 Anti-tank Rocket Grenade Launcher was developed from the late WWII German Panzerfaust (Tank Fist).
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The Soviet name for the RPG-2 is Ruchnoy Protivotankovy Granatomyot which translates to "Handheld Anti-tank Grenade Launcher" 
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It was first issued to Soviet troops in 1954. Widely distributed to Soviet-Bloc countries and their allies, it was also made in China as the Type 56 and used by North Vietnam as the B-40.
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The usual munition was the PG-2 shaped charge (HEAT) anti-armor  single stage rocket which has a useful range of 100 to 150 meters and a penetration of about 6" RHA (Rolled Homogeneous Armor).
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During the Vietnam war, the RPG-2 and RPG-7 were responsible for many casualties when used against the M113 APC and other lightly armored vehicles in service by the US and South Vietnamese armies.  It was observed however, the RPG-2/B40 was actually more effective than the RPG-7 against light armored vehicles.  This was due to the physics of the PG-2 shaped charge which has a shorter and wider explosive cone angle than the PG-7 thereby creating a larger diameter penetration which increases the so called "Beyond Armor Effects" 
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The RPG-2 while long obsolete, may still be present in a few countries and is in use by non-state, and irregular forces in some parts of the world.
Not surprisingly they have also been observed in Ukraine.
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