North Korea frequently taunts its rivals with a nuclear destruction, and despite its own dire economic and social situation, Pyongyang certainly has the military capabilities to instigate a war that could kill hundreds of thousands, if not millions.

Nuclear weapons, ballistic missiles, thousands of artillery pieces, and millions of fanatical troops are the core of the North Korean threat. But Kim Jong Un has another ace up his sleeve: potent special operations forces.

Not much is known about this force, but recent revelations by a senior North Korean spy who defected offer some insight into how Pyongyang’s commandos train and fight.