The largest executive department in terms of its government agency is the department of defense.
The Department of Defense is the biggest government agency, with more than 1.3 million men and women on functional duty, nearly 700,000 civilian personnel, and 1.1 million citizens who operate in the National Guard and Reserve forces.
The departments with the three biggest budgets—HHS, Defense, and the Treasury—accounted for about three-fourths of the spending by all the departments. The next three biggest departments were Agriculture, Labor, and Veterans Affairs.
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