Office of the Secretary of Defense

DOD Seal

The Office of the Secretary of Defense (OSD) is responsible for policy development, planning, resource management and program evaluation. OSD includes the offices of top civilian defense decision-makers with regard to personnel, weapons acquisition, research, intelligence and fiscal policy, as well as offices the Secretary establishes to assist in carrying out assigned responsibilities.


Dr. Mark T. Esper
Secretary of Defense

The U.S. Secretary of Defense oversees the Department of Defense and acts as the principal defense policy maker and adviser.

Dr. Mark T. Esper

Acting Secretary of Defense

Deputy Secretary of Defense

The Deputy Secretary of Defense is in charge of the Defense Department’s day-to-day business. The primary responsibility is managing the defense budget and executing the Defense Secretary’s priorities.

David L. Norquist

Performing the Duties of Deputy Secretary of Defense

Major Elements of OSD

See how other leaders accomplish the DOD mission by visiting the websites below.

  • Policy
  • Personnel
  • Research & Engineering
  • Acquisition & Sustainment
  • Intelligence
  • Reform