What military background? Does anybody in the NK Army have any experience other than brutalizing unarmed peasants?
They regularly run SF infiltration missions into the ROK. Additionally, according to wiki:
...over 7,000 military advisers, primarily from the Reconnaissance Bureau, have been dispatched to some forty-seven countries. Some of the organisations which received North Korean aid include the Polisario Front, Janatha Vimukthi Peramuna, the Communist Party of Thailand, the Palestine Liberation Organization and the Army of the Guardians of the Islamic Revolution. The Zimbabwean Fifth Brigade received its initial training from KPA instructors.
North Korean troops allegedly saw combat during the Libyan-Egyptian War and the Angolan Civil War. Up to 200 KPAF pilots took part in the Vietnam War,scoring several kills against US aircraft. Two KPA anti-aircraft artillery regiments were sent to North Vietnam as well.
North Korean instructors trained Hezbollah fighters in guerilla warfare tactics around 2004, prior to the Second Lebanon War.