Yonpo Airfield (K-27 Air Base)

Yonpo Airfield, also designated as K-27 Air Base, is located near Hamhung in South Hamgyong Province, North Korea. Established in the 1940s by the Imperial Japanese Army Air Service, the facility was constructed with concrete surfacing.

During the Korean War, the airfield was the site of multiple engagements. Following UN aerial strikes in July 1950, the 5th and 7th Marine Regiments captured the area on October 30, 1950. The United States Air Force (USAF) subsequently designated the installation K-27. In late 1950, the base served as a base of operations for close air support and medical evacuations during the Battle of Chosin Reservoir.

The airfield hosted several units during this period, including the 35th Fighter-Interceptor Group, which comprised the 39th and 40th Fighter-Interceptor Squadrons operating F-51Ds and the 339th Fighter-Interceptor Squadron operating F-82Gs. Marine Aircraft Group 12 also operated from the site, including VMF-212 with F4Us, VMF-311 with F-9Fs, and VMO-6 with OY and HO3S aircraft. Other units included the 437th Troop Carrier Wing, which operated C-46s, and No. 77 Squadron RAAF, which operated F-51Ds.

Infrastructure during the UN occupation included a Marine Ground Control Intercept Squadron 1 radar site and a casualty clearing station for X Corps. Between December 14 and December 17, 1950, the USAF Combat Cargo Command utilized the airfield to evacuate approximately 4,000 personnel and 20,000 tons of cargo. The field was closed on December 17, 1950, as operations moved to Hungnam.

The Korean People's Air Force subsequently controlled the airfield. In 2021, the military infrastructure was demolished, and the site was converted into the Ryonpho Greenhouse Farm.