The Department of Operational Support (DOS) was established to provide operational advisory services to operating entities across the Secretariat, including other departments, offices away from headquarters, field missions, and regional commissions. The Facilities and Commercial Activities Service (FCAS) under the Division of Administration (DOA) operates the Headquarters complex, striving to provide effective and efficient planning, management, maintenance and operation for all existing physical facilities and assets at the UN Headquarters, New York. FCAS also supports office and conference facilities, property management, travel and transportation services, archives and records management, mail and pouch operations, catering, giftshop and the United Nations Postal Administration. The Mail Operations Unit (MOU) under the Special Services Section (SSS) in FCAS ensures the continued provision of efficient, effective and high-quality mail operations. These positions are located in the MOU of the SSS within the FCAS under the DOA in the DOS. The incumbents directly report to the sub-unit Supervisor under the general supervision of the Unit Chief.