How is the modern Department of Defense different from the old Department of War?

It is a cabinet department and not an independent executive agency.
It was not created by any act of Congress, unlike the Department of War.
It contains sub-departments for the Air Force, Army, and Navy.
It is no longer concerned with defending the nation through military force.

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The modern Department of Defense different from the old Department of War is that it contains sub-departments for the Air Force, Army, and Navy.

c- It contains sub-departments for the Air Force, Army, and Navy.