9 Administrative Service. This Service shall be responsible for providing the Commission with efficient and effective staff services relating to personnel, information, records, supplies, equipment, collection, disbursement, security and custodial work. Finance and Management Service. This Service shall be responsible for providing the Commission with efficient and effective staff advice and assistance on budgetary, financial and management matters. Planning Service. This Service shall be responsible for providing the Commission with efficient and effective staff services relating to planning, monitoring, and evaluation of programs and projects. Legal Service. The Legal Service shall be responsible for providing Muslim Filipinos with legal education and assistance in case of litigation involving their persons or interests; act as the legal counsel of the Commission; and investigate cases involving its personnel and submit appropriate recommendations pertaining thereto. SEC. 13. Regional Ofices, Field Ofd e$ Sub-Ofices. The Commission is hereby F authorized to establish, operate, and maintain Regional Offices in such appropriate administrative regions of the country, each of which shall be headed by a Regional Director. A Regional Office shall have, within its administrative region, the following Implement laws, rules, regulations, policies, programs, and projects of the Commission; Establish regional and provincial HajJ coordinating and monitoring units; Provide efficient and effective service to Muslim Filipinos; Coordinate with regional offices and agencies of the executive department; Coordinate with local government units; and Perform such other functions as may be provided by law. The Commission is likewise authorized to establish, operate, maintain, and determine the functions of field offices and sub-offices, whenever necessary, appropriate and feasible.