Designed by the five scientists, the Tallgeese was the first armed mobile suit, and is the common ancestor of both the Gundams (specifically their prototype, the XXXG-00W0 Wing Gundam Zero) and the mass-produced military mobile suits (most notably the OZ-06MS Leo and its variants).
In the EW version, a “Tempest” Heat Lance and Heat Halberd were added to its arsenal, and the suit was eventually upgraded into the OZ-00MS Tallgeese Flugel whereby the “Super Vernier” boosters were replaced with wing binders for better mobility in space.