This special operation commando unit trained for two years and spent their final 15 days rehearsing action on the objective in a full - scale mockup of the Blue House .
Thirty - one men were handpicked from the elite all - officer KPA Unit 124 .
This special operation commando unit trained for two years and spent men 's final 15 days rehearsing action on the objective in a full - scale mockup of the Blue House .
Thirty - one men were handpicked from the elite all - officer KPA Unit 124 .