Command earth's forces against the ALIEN TERROR . Shooting down UFO's is just the beginning , you must then lead a squad of heavily-armed soldiers across different terrains as they investigate the UFO crash site . Tackle the aliens with automatic rifles , rocket launchers and even tanks in the struggle to retrieve useful technology , weapons or life forms . When your engineers have amassed sufficient research data on their superior weapons and craft, they'll be available for your troops to use...... UFO: Enemy Unknown.... Extremely Close Encounters .