Reference
OpenAI's Answer
The Office of the Secretary of Defense (OSD) is a central part of the United States Department of Defense. Its main responsibilities include:
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Policy Development: OSD is deeply involved in crafting policies related to national security and defense.
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Planning and Coordination: It handles planning and coordination within the Department of Defense to ensure effective resource management and program evaluation.
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Resource Management: It manages financial resources and oversees various defense programs and initiatives.
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Program Evaluation: OSD evaluates defense programs to ensure they are meeting strategic objectives and making efficient use of resources.
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Authority and Control: It assists the Secretary of Defense in exercising authority and control over the Department of Defense's operations.
For more details, you can check the Wikipedia page on OSD or their official DoD page.