Technology & Combat Characteristics
The OZ-00MS2 Tallgeese II was built exclusively for Treize Khushrenada, the leader of the World Nation. It was assembled from spare parts of the OZ-00MS Tallgeese, but has a different head crest, a new face mask that resembled the Gundam's, and the colors on part of its chests, shoulders, waist, back-mounted boosters, and shield have been changed to blue. This blue color was said to reflect Treize's intention to sortie as a representative of the Earth. Although certain sections of the Tallgeese II were made of gundanium alloy, the mobile suit's basic performance was unchanged from the original Tallgeese.
History
During the Eve Wars, Treize led his troops on an assault of the White Fang's large battleship, Libra. After ordering the Leo Motherships to hold their positions, Treize flew the Tallgeese II within the firing range of the Libra's main cannon, challenging White Fang's leader, Milliardo Peacecraft, to a duel.
When his request was denied, Treize demanded that Milliardo fire on his Tallgeese II in order to end the war. The Tallgeese II would have been destroyed by the Libra's main cannon if not for the XXXG-01W Wing Gundam knocking it out of the path of the cannon's beam. Lady Une revealed herself to be the Wing Gundam's pilot and reminded Treize that "one must fight the battle in order to witness its true beauty".
After this, Treize ordered the destruction of the Libra and proceeded to shoot down numerous WF-02MD Virgo IIs. Later in the battle, Treize encountered Gundam pilot Chang Wufei in the XXXG-01S2 Altron Gundam and fought a one-on-one duel with him. Despite having the upper hand in the fight, Treize ultimately allows Wufei to pierce the Tallgeese II's cockpit, causing it to explode and killing Treize.