multiplayer setup, Arma 3, cooperative gameplay, squad, tactical, military simulation, private server, LAN party, voice communication, Discord, team coordination, mission briefing, custom scenarios, mods, Steam invite, join friends, session host, realistic combat, dynamic weather, day-night cycle, in-game voice chat, map strategy, briefing room, loadout customization, teamwork, PvP, PvE, real-time tactics, first-person shooter, strategic planning, joint operations, headsets, gaming community, user-created content, server password, high-resolution textures, immersive sound effects, ambient lighting, detailed environment.