Here is some more information about the ROK F-5 jet crash accident that killed 3 pilots:

Soldiers yesterday comb Mount Hwangbyeong to recover the wreckage of two jets and the body parts of their deceased pilots following a crash Tuesday. By Kim Tae-seong

The officer said that the South Korean Air Force began its full-scale probe into the cause of the crash.

The Air Force said it is looking at four possible causes: pilot error, a midair collision, a loss of consciousness or engine problems. The Air Force indicated first two are the most likely. The operation was a training exercise for a beginner pilot.

“Weather conditions either around Gangneung Air Base, where the aircraft took off, and the crash site were not poor enough to ground military aircraft,” another Air Force officer said. “It will take some time to figure out the precise cause of the accident.”

Some say that one of causes of the crash was a shortage of skilled ranking officer pilots. Last year, 142 ranking pilots voluntarily left the Air Force. In 2004, the number was 44. The figure in 2005 was 81 and it steadily increased to 102, 138 and 145 in 2006, 2007 and 2008, respectively. An officer said all those pilots joined commercial airlines.  [Joong Ang Ilbo]

I would think it is way too early to say a skilled pilot shortage is the cause of the accident without knowing the flight hours and qualifications of the pilots involved.