A military trainer aircraft crashed in central South Korea Tuesday during a routine training mission, killing the two airmen aboard, officials said. The jet hit a rice paddy near the Air Force Academy in Cheongwon of North Chungcheong Province, about 120 kilometers south of Seoul, around 1:30 p.m., they said. \"The Air Force is investigating the cause of the crash,\" an Air Force official said. The single-engine, propeller-driven Ilyushin II-103 aircraft, called the T-103 in South Korea, is a primary trainer for the South\'s Air Force. The aircraft was developed by the former Soviet Union in 1990 and is now produced in Russia.