It looks like the developers made an effort to stick to the fine atmosphere in the book, and stay true to the movie esthetics. That means that the player will sense the desperate struggle of the MI for the preservation of Mankind, and not yet another Space War that we've seen so many times before in other games. The player begins the game as a young lieutenant, just out of the Academy, and in charge of a small unit. Being the CO, he is responsible for every trooper in his squad, and participates in missions side by side with them. As the troopers gain experience, they gain better armament and armor.
Infantrymen go through mission after mission, and gain experience only in combat.
Each trooper will have an inventory with armor slots and nine other items. Your squad will belong to a platoon that will be formed of six squads altogether. For every six troopers there will be a squad leader. In case the veterans in your squad get KIA, the rookies from the platoon will replace them. In some missions, the entire platoon will have to act.