(Got Info from Wiki but is included with my take)
Universe 6: Universe 6 includes planets, stars, a large amount of galaxies. Universe 6 is also linked with Universe 7, creating a twin universe. Being a twin universe, almost identical to Universe 7, any planets that have existed and/or exist in Universe 7 will also likely have existed or exist in Universe 6. The majority of planets are unknown, but it is known that Universe 6 has an Earth, although the Earthlings of that world had ravaged it with wars, rendering the species extinct
Saiyans: The Saiyans of Universe 6 differ from their Universe 7 counterparts in that they never left Planet Sadala and are a more heroic species. Additionally, they have evolved so they no longer possess tails and subsequently can't access the Great Ape form through conventional means. But very rarely(1% meaning only two can be born with a tail every 500 years or so), those born with tails hold the latent potential to rival even that of the Legendary Super Saiyan that's born every thousand years.
Sadala Army: The Sadala Army is the Saiyan military force in Universe 6. It is the mightiest army in that entire universe. The Sadala Defense Forces is a sub-group of the army made up of Saiyans in charge of protecting Planet Sadala from foreign invaders in Universe 6.
Planet Sadala: It is is the homeworld of the Saiyan species. Like their universe 7 counterparts, power level is measured at birth while Saiyan infants are inside a incubator pod and they also have a class system and depending on their initial power level decides what type of class they are.
Low Class: 1-300,000
Mid Class: 400,000- 2,000,000
Elite Class: 3,000,000+