There are many competitive leagues in the sport of paintball with their own terms and rules.

Teams that compete in both NPPL and NXL leagues
Baltimore Trauma( a.k.a Montreal Image in NPPL)
Jacksonville Raiders
Los Angeles Ironmen
Los Angeles Infamous (a.k.a. Oakland Assassins in the NXL)
New England Hurricanes (a.k.a. New York Hurricanes in the NXL)
Pittsburgh All-Americans (a.k.a. Philadelphia Americans in the NXL)
Portland/Seattle Naughty Dogs
Sacramento XSV (Pronounced "Excessive")
San Diego Dynasty

Teams that compete in only NPPL
Chicago Farside (formerly Chicago Evil)
Dallas Elite
Edmonton Impact (fields an Open Xball team, but has not gained NXL franchise)
Jersey Authority
Las Vegas LTZ (team withdrew from NXL and currently only competes in NPPL)
Miami Rage
Oakland Blast (team [as San Diego Legacy] withdrew from NXL and currently only competes in NPPL)
St. Louis Avalanche (fields an Xball team, but is currently ranked Open in PSP)
Stockholm Joy Division

Teams that compete in only NXL
Chicago Aftershock
Detroit Strange
Russian Legion (Boston Red Legion)
San Antonio X-Factor (fields an NPPL team, but is currently ranked Semi-Pro in NPPL)
Ultimate

Teams that compete in the Millennium Series (Europe)
Stockholm Joy (Sweden)
Stockholm Ignition (Sweden)
Toulouse Tontons (France)
Marseille Icon (France)
Montpellier Influence (France)
Grenoble Vision (France)
Manchester Shockwave (England)
Manchester Kelly's (England)
London Nexus (England)
Frankfurt Syndicate (Germany)
Sacramento XSV (United States of America)
Philly Dogs (United States of America)
Zürich Consilium Dei (Switzerland)
Copenhagen Ducks (Denmark)
Moscow Phoenix (Russia)
Oslo Menace (Norway)