Some shooting games focus on quick reflexes and super-fast reactions. Others aim to recreate a realistic feel of the battle. One way they do this is to encourage players to communicate with each other to win.
Squad-based shooting games pit large groups of players against each other and then split each side into smaller squads or platoons of players. Each squad needs to communicate with each other to stay alive. But also, each group must communicate with each other to coordinate their attacks -- often via a leader selected in each squad.
There are also some offline games that focus on the squad as the gameplay mechanic. Games like Spec Ops: The Line develop a connection between the player and their comrades for narrative effect.
This list includes 39 games from the last 29 years, with 440 likes. They come from a range of different genres and play-styles and are all good games if you want to co-ordinate troops for objectives.