《明史·志·卷六十六》
景泰初年，边疆之事紧急，调来操练的军队都留在京城，隔一年纔放回去取来衣服装备。
景泰初，边事棘，班军悉留京，间岁乃放还取衣装。
In the early years of Jingtai, the situation on the borders was urgent, and the troops called up for training were kept in Beijing and only released every other year to retrieve their equipment and clothing.