Question

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.

Explanation:

The Department of Defense (DoD) was created to unify the military services (Air Force, Army, Navy) under one department for more coordinated defense. The old Department of War did not have this unified structure with sub - departments for these services in the same way. The DoD is a cabinet - level department and was created by an act of Congress, and its main purpose is still national defense through military force.

Answer:

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