sport and recreations, professional sport competitions are now held. These type of games are also used for tactical gunfight training by military and law enforcement agencies to some extent. Olympic dueling Olympic dueling is an archaic individual sport that sought to safely emulate the deadly practice of pistol duelling, akin to fencing emulating sword fighting. It involved the use of specially built primer-fired pistols to propel wax bullets. Two versions of the sport were demonstration events at the 1906 Olympics and 1908 Olympics. It was also a popular sport in France. Paintball Paintball is a competitive sport in which players from opposing teams eliminate opponents out of play by hitting them with round, breakable, dye-filled oil and gelatin pellets ("paintballs"), shot from HPA/-powered air guns called paintball markers. It can be played on indoor or outdoor fields scattered with natural or artificial terrain, which players use for tactical cover. Paintball game types vary, but can include capture the flag, elimination, ammunition limits, defending or attacking a particular point or area, or capturing objects of interest hidden in the playing area. Depending on the variant played, games can last from seconds to hours, or even days in scenario play. The game was developed in the 1980s and is now regularly played at a formal sporting level with organized competition involving major tournaments, professional teams and players. National Xball League is the United States' professional paintball circuit. The league consists of a Professional Division, consisting of the best players the sport has to offer, that extends down to the beginner ranks of "Division 5" for those newer to the tournament atmosphere. The league hosts five national events across the country in places such as Las Vegas, Dallas, Nashville, Cleveland, Chicago, Atlantic City and Orlando throughout the year, starting in March and ending their season in early November. The league's largest event each year is the season finale known as the World Cup, with the 2016 World Cup hosted 3,554 players from 35 countries. National Collegiate Paintball Association is an all-volunteer, non-profit organization created by United States college players. The goal of the NCPA is to promote the positive aspects of the sport in an intercollegiate manner. The NCPA consists of two distinct classes which competes separately — Class AA is an open-class division where any college may enter and compete in regional and national tournaments. Class A is a closed-class division where