Emerian Empire and United Commonwealths
The Emerian (Star) Empire and United Commonwealths (and Republics), or ESE, is extremely large in all areas, from population and penis size to it's military. But despite it's size, it has probelms with technology, as it was isolated for eons by a mysterious barrier called, "The Veil."
Military
Emeria's military is vast, to put it lightly. In every single one of their colonies, systems, and galaxy, the Emerians can muster a military force to make even the most hardened abomination cringe. But there's always a catch: Emeria's military is behind technologically; still employing rifles and almost Napoleonic formations against modern weapons and fortresses. Thus, in recent decades and clashes with groups like the Assyrian Star Empire, Emeria's military has been quickly adapting to the outside universe, by upgrading their rifles and SMGs, creating Power Armor and experimental weapons, and signing research deals with foreign powers, giving them access to technology and new materials, and military machines, like their Mecha, the SPARTAN.