 An additional function of the PSU is to support the coordination of special events that take place in, and around the Pentagon Reservation.The PSU serves as the single point of contact for PPD on all ceremonies in honor of visiting dignitaries hosted by the Office of Secretary of Defense and the Chairman of the Joint Chiefs of Staff.Various protocol offices such as the Joint Chiefs of Staff, Office of the Secretary of Defense and the Office of Defense Foreign Affairs utilize PSU officers to assist their organization and ensure their events operate as smoothly as possible.