The Union of Soviet Socialist Republics.
When written in the Russian language, which uses the cyrillic alphabet, it comes out as CCCP
Lead country of the Warsaw Pact, even though they might not have admitted it at the time.
Broke up after Gorbachev and glasnost, leaving a load of smaller republics such as the Ukraine and Estonia to go their own way, although the Russian Federation, the rump of the USSR, is still the most powerful, most influential and got the lion's share of the nukes.
The USSR had a huge military force and were likely to be the visiting side if we ever had to play the home game.
Small arms distributed by the Soviet Union such as the AK-47 (7.62x39mm), RPD (7.62x39mm), AK-74 (5.56x39mm), RPK (5.56x39mm) and AKM (7.62x39mm) have wound up in the hands of most 3rd world conventional armies, terrorist/militant groups and the Mafia. Hence the AK series of weapon systems are the main opponent to ISAF, NATO and UN forces in the middle east. The AK series of weapons have many considerable advantages, such as the fact they can be buried in the sand for 70 years and still operate, but they are also prone to inaccurate fire upwards of 400m (albeit the effective range of an AK-47 is around 600m). However the AK-74 series chambered in 5.56x39mm (they copied NATO) are much more accurate however they do have a shorter MBR (Maximum Battle Range) of 400m.