I guess you are a newfag.
A wall is a force multiplier, no need for a continuous wall to get control of the situation. Sections are built where they can stop invaders just by been there allowing troops to be used eficiently elsewhere. In other words there is more than meets the eye.
>Unusualy tall South Koreans were chosen for the post so as to look intimidating to the soldiers from the north. While USA and SK kept manning the post with tall soldiers the NK side was able to do the same and actually thu the years they kept shrinking until the pic became normality.