List of components of the U.S. Department of Defense
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| Commander-in-Chief: | President of the United States, Donald Trump |
| Secretary of Defense: | Pete Hegseth |
| Chairman of the Joint Chiefs of Staff: | General Dan Caine, USAF |
| Military budget: | $718 billion (2018) |
| Employees: | 700,000 civilian 2.8 million military (2008) |
The chain of command of the U.S. Department of Defense leads from the president (as commander-in-chief) through the secretary of defense down to the newest recruits. The Department of Defense oversees a complex structure of joint command and control functions, split generally into administrative and operational chains of command. The following is an incomplete list of the various major military units, commands, and DOD offices and agencies, including civilian and military chains of command.