Squads are extremely important in the Zombies mode for Call of Duty: Modern Warfare 3. While players can choose to venture in solo, having a squad to watch your back will make completing objectives easier and survive in the harder threat zones.
How to Invite Players to Squad in MW3 Zombies
The Zombies mode in Modern Warfare 3 allows players to form a team of up to three people before starting a game with each match having 24 players at one time. However, players can add another three people to their squad mid-match for a total of six players in one squad.