It was mostly returned to farm land from the late 1960s onwards, though the site is still owned and used to some extent by the Republic of Korea Air Force, in particular a grass airstrip known semi-officially as Alddreu Airport.

The local population were used as forced labour to flatten and clear the landscape, and later to build underground tunnels.

During the Second Sino-Japanese War it was also used as a forward base of the Omura Naval Air Group for the bombing of cities in China such as Shanghai and Nanjing.

Fearing a fight on Japanese soil, they planned on using Jeju's Alddreu Airfield as a last resort to defend against the Allied forces.

These include 19 (out of an original 20) World War II aircraft bunkers, and a 1,400-meter grass runway which is still in use as a reserve airstrip by the ROKAF.