Located on the outskirts of Gyeryong is the large military complex Gyeryongdae (계룡대), the headquarters of the Republic of Korea Armed Forces branches.

Due to the city's proximity to Gyeryongdae, approximately half (47%) of its inhabitants are connected to the military as service personnel and their dependents or civilian employees.

From 1989-93, the headquarters was relocated from several locations in Seoul to a more spacious and newly built integrated complex.

[2] Mount Gyeryong (Korean: 계룡산), adjacent to the city, is considered to have the most qi (spiritual energy) of any mountain in the country and is also the heart of Gyeryongsan National Park.

[4] Due to the proximity of Gyeryongdae, the Republic of Korea Armed Forces and Ministry of National Defense are major employers.