The only thing standing between the colony's survival and complete destruction is an elite squad of human ISA forces. Players can select between four ISA troops - each with special abilities and weaponry to accommodate their playing style and battle through 11 intricately detailed environments that showcase the harsh setting of a war-ridden planet. Additionally, players can visit the armory and equip themselves with 27 different unique weapons. In particular, there are 21 first-person weapons that the player can carry, five emplaced weapons, and hand grenades.