Juneau had always been an inventive child, according to the reports from her schoolteachers. She always envisioned a way for her to be able to venture across her home district of Shiganshina much more easily, instead of just walking around from day to day. Through research, effort, and studies, she would eventually be able to reach this goal.
Sketch after sketch, Juneau began to try to design a type of gear a person could wear to be able to fly, as the birds above her had. Through trial and error, she eventually developed what we know as “Three Dimensional Moving Gear”, but to her, it was her “Personal Utility Transport”, or P.U.T. Juneau had utilized wires from the lifts, which are used to lift cargo, amongst other things, atop the wall. In addition to other mechanisms, her gear seemed to be a fairly stable prototype; however, she ran into one issue, namely, fuel. With the help of a local stonemason, named Hubert Shrives, she was able to transform iceburst ore into iceburst gas, which was able to help power her P.U.T. gear.
After some tweaks, Juneau shocked the populace of her district by one day zooming across Shiganshina, but she not only got the attention of the citizens, but also some Military personnel, who believed that her gear would be extremely useful to them in their fight against the Titans. Remembering the days she lay scared as a child within her home during spikes of Titan Activity, Juneau decided that this would be best not only for her, but for Humanity as a whole. From that point on, the Military began producing “Three Dimensional Moving Gear”, known as 3DMG. For her contributions to Humanity, Juneau Thrax was given the title “The Savior.”
Following her work for the Military, it appears that Juneau has gone into hiding, preferring to live a private life, away from the pomps and circumstance she was awarded for her brilliant invention. As of 794 AHR, the status of Juneau Thrax is unknown.
Today, 3DMG has become a common tool within the military's arsenal. In the year 853, the same year as the Breach of Wall Maria, 3DMG became standard issue for all members of the military. The Breach marked a paradigm shift in public sentiment as the population increasingly rallied behind the idea of utilizing 3DMG as a means to counter the Titan threats beyond the Walls and to hopefully one day reclaim Wall Maria.