US and South Korea joint air force drill

The five-day combat exercise known as "Vigilant ACE," follows last week's North Korea intercontinental ballistic missile launch.

The drills are drawing serious attention, with about 12,000 U.S. personnel participated with South Korean troops, 230 aircrafts, and 6 F-22 Raptors. According to the South Korean Ministry of Defense, the drills are intended to enhance the cooperation between South Korea and the US in all conditions, weather and time.