During the Korean War, the U.N. Far East Air Force (FEAF) used some 15 air bases in Japan to support combat operations in Korea. In addition, the Air Force either improved or constructed some 55 airfields. These air bases were all numbered and some became better known by their number than by their name. The more important of these airfields included: K-1 Pusan West K-2 Taegu K-3 Pohang K-5 Taejon K-6 Pyongtaek K-8 Kunsan K-9 Pusan East K-10 Chinhae K-13 Suwon K-14 Kimpo K-16 Seoul K-40 Cheju-do Island K-46 Hoengsong K-47 Chunchon K-55 Osan