Most players will be wearing some form of military fatigues and most players use military webbing. High realism games enforce realistic rules such as restricting the amount of ammunition in a magazine to that of the real weapon. Teams tend to have individual uniforms and types of webbing, they even carry kit that has no use in the game just because it adds to the realism. Simulation Level Basic games are little more than free for alls. There is very little use of tactics and co-ordination between players is limited.
Normal games involve organised teams that at least try to use military style doctrines and tactics.
Advanced games try to perform as would military units, often following specific rules of engagement for each game. Game Style Simple games tend to be things like capture the flag or last man standing. Average games involve a more complex setting or scenario that gives the various teams individual objectives. Complex games tend to run across multiple scenarios where the missions build on one another. They have a lot in common with role-playing campaigns.