The Republic of Korea Air Force (ROKAF; Korean: 대한민국 공군; Hanja: 大韓民國 空軍; Revised Romanization: Daehanminguk Gong-gun), also known as the ROK Air Force, is the aerial warfare service branch of South Korea, operating under the South Korean Ministry of National Defense. The ROKAF has about 450 combat aircraft of American design, in addition to a few Russian, European, and indigenously-designed aircraft.