XIG (eXpanded Interceptive Guardians) is an Earth defense team under the command of GUARD. XIG is led by Commander Akio Ishimuro, and headquartered in the Aerial Base, a floating sky fortress, utilizing the Repulsor Lift technology created by Gamu Takayama, which allows the base and XIG's fighters to defy gravity. The Aerial Base hovers directly above in GUARD's Geo Base.