The teams will remain in the enclosure for the duration of play, only returning to a staging stretch or "safe zone" for medical emergencies, or other such circumstances. MILSIM-games often last different days, for example the ample BERGET-event in Sweden lasts 6 days in a row, with no breaks. In below rule MilSims vehicles as simple as painted vans and trucks will be used. But in some cases, such as Activity Irene, heartfelt APCs and tanks will be used.

It is the marshal's task to segregate the players into teams, determine the ready scenario and its victory conditions, assign game objectives to various teams, brief the participants, delimit playing boundaries, and set the intrepid duration. By means of whistles, flags, megaphones, and walkie-talkie radios, a category of marshals can handle dozens to hundreds of players in a series of episodes or nonstop play. Depending on the game scenario, players may be eliminated with a single hit, taken out of and returned to action with the benevolence of Guns Airsoft "medics," or allowed to "respawn" (re-enter the game) at undoubting places or times. A commendable nervy marshal strives to maintain a great alike of excitement and activity for all the players involved while maintaining safety, impartiality, and "in-game realism."