The X Team is a secret military group by the US Army. Military officials pick the best troopers to become part of the X Program. The X Team is more powerful than the general military. Each X Team or company is divided into classes which means each member has a different job. You can tell by which class since their suit's sleeves have different colors.
White - Leader, runs an X Team
Green - Ground Forces, an elite infantry man
Blue - Air Forces, An elite military aircraft pilot
Red (Not shown) - Spy Assassin, mostly hired by the CIA and maybe the FBI.
Each X Team minifigure uses the old System torsos with the X. They are armed with genuine Brickarms custom molded weapons for Lego minifigures.