MilSim is an abbreviation of Military Simulation, and refers to military simulations conducted by civilians for entertainment purposes. Military Simulation has the meaning of simulating military operations with the highest degree of realism. There are several forms of MilSim: airsoft games, paintball games, and video games simulating military scenarios and tactics. Airsoft guns are used more often
in MilSim than paintball guns due to their availability as replica weapons without any modification. Paintball guns commonly require modification to be considered a replica; the basic components of paintball guns often inhibit the ability to convert them to replica weapons such as the hopper or gas tank. These components can be hidden or modified such that they do not interfere with the appearance of the gun. MilSim most often falls into two different categories: reenactment and simulation. Reenactments focus on a particular event in history and aim to provide the most accurate representation of the time period, events and outcomes of the historical event. Simulation however may only focus on a particular time period and representation of which course a particular situation may have taken in history. In most cases a simulation event includes fictitious characters, groups and political situations. Airsoft
Airsoft is a recreational pastime in which individuals participate in the simulation of military combat also called MilSim or law enforcement-style combat. Some Airsoft Teams specialize in Milsim and historical reenactment intended to get the participant "inside the head" of the characters from history. This is an immersive experience and gives participants a chance to live recent history. Many airsoft groups have ex-military members seeking the camaraderie of their old units without the commitment. Some groups support military charities as part of their mission.