Airsoft gameplay varies in style and composition, but often ranges from action shooting to short organized live action role-playing (LARP) scenarios, close quarters battle skirmishes, military simulations (MilSim) or historical reenactments. It is played in indoor courses or outdoor fields. Combat situations on the field may involve the use of genuine military tactics to achieve objectives set in each game. Participants may attempt to emulate the tactical equipment and accessories used by modern military and police organizations. A game is normally kept safe by trained professionals acting as supervisors and umpires.