North Koreas border patrol rotates out personnel every three to six months
The 25th Border Guard Brigade, which is stationed in Yanggang Province, has been replacing its personnel every three to six months.
In the event of a serious incident, military units may arbitrarily replace battalions or company units; in ordinary times, however, platoons and squad units are replaced every three to six months.
The targets of these three-month rotations are trouble-making soldiers and battalions stationed next to villages. While the goal of six-month rotations depends on the particular circumstances, the decision to replace a unit generally seems to be in response to soldiers developing a close relationship with local villages. ......
[Source: Daily NK]