Administrative Code of 1987
Section 18. Organizational Structure. - The Department shall be composed of the Secretary, the Undersecretary and Assistant Secretaries and their immediate staffs as determined by them respectively, and such other bodies as are provided by law.
The Government Arsenal, Office of Civil Defense, Philippine Veterans Affairs Office, Armed Forces of the Philippines, National Defense College of the Philippines and the Integrated National Police shall be under the supervision and control of the Department, except as may be provided by special laws.