Aliens: Fireteam Elite/Gameplay

In the game, you get to be a Marine, which you can customize appearance- and clothing. You start the game in the hanger of the Marine's ship, The Endeavour, and you can interact with certain people to e.g. enter a mission, or shop for items, or reveal in-universe information.

In the mission, you will be suppoprted by two partners, which can be either other players, or if absent, will be NPC synthetics.