The Virgo is the first pure mobile doll, a computer-controlled war machine designed without a cockpit for a human pilot. Developed at OZ's lunar base, it's based on test data gathered from the experimental mobile suits Mercurius and Vayeate and incorporates the destructive self-powering beam cannon design from the OZ-13MSX1 Vayeate and the planet defenser system from the OZ-13MSX2 Mercurius. Fighting in mass numbers or in teams of three, they can combine their planet defensors to form an impenetrable defensive barrier.

When the Romefeller Foundation-controlled OZ carries out Operation Nova, dropping hundreds of Virgos to Earth to wipe out terrestrial opposition, the conventional mobile suit forces of its opponents are literally powerless to resist. Romefeller's new ideal was centered around the mobile doll, in their vain attempt to bring "peace" and "order" to Earth without a high cost in human lives. Though the Virgo isn't as fast or agile as its predecessor, the Taurus, its firepower and defensive abilities more than make up for the performance gap. The Virgo was named after the sixth sign of the Zodiac, meaning "virgin", an appropriate name considering that it doesn't need a human inside it to function. However, the advanced weapons of the Gundams are still effective against these killer robots.

Source: Gundamproject.com, New Mobile Report Gundam Wing