국방홍보원 국방뉴스 국방NEWS 뉴스바바 DEFENSE NEWS ROK newsbaba KF-21 HQS Iron Bird critical technology secret information a confidential affairs KFX KAI roll out stealth Lockheed Martin Corporation fighterplane combat plane a fighter pilot avionics design MFD air-to-air first flight SIL Multi-function display HUD avionics equipment System Integration Laboratory BORAMAE korea air force ROKAF twin engine ge general engine f-35 4.5 generation fighter