There was a show on tv about soldiers that serve near the DMZ. I think it mainly talked about the SK soldier. One of the requirements was that they had to be at least 6 ft to do duty up there. It might even pertain to US Marines also. The thinking behind this was that it be more intimdating to the NK army. I would also say that most if not all the NK army is conscripted and only those chosin to be in the special forces receive the best of the nutrition because with the NK old generals and Kim they use these special forces to control and protect their collective asses.