Joint Fire is built around one simple idea: squad play matters. The Modern Warfare 4 Season 1 event runs from November 13 at 10 AM PT until November 19 at 10 AM PT, giving players six days to earn 1.35 million event XP. Solo matches do not move the reward track, so you will need at least one teammate in your party. Players checking different ways to organise sessions may come across MW4 Bot Lobbies, but the event itself is focused on earning XP w...