The director of the Joint Staff (DJS) is a three-star officer who assists the Joint Chiefs of Staff, a cabinet of senior military officers within the United States Armed Forces who advise the secretary of defense and the president on military matters. The director assists the chairman of the Joint Chiefs of Staff in managing the Joint Staff and with the management and organization of the staff's members. The director also chairs meetings of the Operations Deputies, a subsidiary body comprising the director and a three-star delegate from each service who preview or resolve issues before they are escalated to the four-star level of the Joint Chiefs of Staff.