From Halopedia, the Halo wiki
The Korean Peninsula was previously divided into two countries: North Korea and South Korea. A few hundred years prior to the Human-Covenant War, a long sought after treaty united the two. After the creation of the United Nations Space Command, many different bases—military and otherwise—were established in the country. These became sites of critical importance for the testing of ordnance and the training of officers, especially during and after the Covenant War.
Economy and society
United Korea is known as a technological powerhouse. This came about largely due to its government's strong emphasis on education. The country is home to many many significant UNSC facilities that specialize in training, weapons testing, and MJOLNIR Powered Assault Armor development.
List of appearances