The Republic of United Species

Introduction
The Republic of United Species also known as the RUS or The Republic, is an Alliance made up of human, Sangheili, Unggoy, Kig-yar, and Hurakok species. The thought go to mind by Terrence Hood II and The Arbiter to unify all sentient species to prevent any future conflicts. The idea was a success in 2557 and they were both appointed as the highest military leaders in the Republic.

War with the Jiralhanae
Before the Republic was ever thought of, the Sangheili were at war with the Jiralhanae from October 2552 to 2555. It is also the start of the human-Sangheili alliance. However at the beginning of the war the Sangheili took the heaviest casualties as Sangheili Shipmasters, soldiers, and honor guards were replaced by the Jiralhanae. Eventually the Sangheili realized that they couldn't fight them on their own, so they asked the humans for support. Still, with having 2/3 of it's military and navy destroyed the humans agreed, in return the Sangheili would help the humans rebuild their infrastructure and military. However, for both sides the Jiralhanae still proved too difficult, they then asked the Kig-Yar and Unggoy, they both also agreed, however the humans did not like the Kig-Yar, and the Unggoy were too unorganized. Finally, after countless fights to take back both human and Sangheili colonies they found the Jiralhanae homeworld. The Sangheili saw that the Jiralhanae were smart enough to destroy navdata on their ships just as the humans did during The Great War. But the Jiralhanae weren't fast enough for one ship. Then in 2555, the Sangheili bombarded, or glassed the planet. They did this to lower the high casualties that they would've faced.