MilSim Military Simulation generally combines airsoft stage show with some military live-action role-playing elements. Several goals or missions are assigned to each team, along with a basic load-out of charge Guns Airsoft (6 millimeter pellets), rations, batteries, and other suitable equipment, such as short-range radios and head-sets.

The teams will remain in the mead for the duration of play, only returning to a staging division or "safe zone" for medical emergencies, or other such circumstances. MILSIM-games often last disparate days, for model the large BERGET-event in Sweden lasts 6 days in a row, with no breaks. In larger computation MilSims vehicles as simple as painted vans and trucks will be used. But in some cases, such as Enterprise Irene, bona fide APCs and tanks will be used.