《明史·志·卷六十六》
又免除大宁等卫军到京城操练，改成防守蓟镇，上调京城的军队于是耗损减少。
又免大宁等卫军京操，改防蓟镇，班军遂耗减。
He also exempted the army of Daning and other guards from training in the capital, and changed it to defending the Jizhou garrison, so the military expenses of the capital were reduced.