The economic activity of a society consists of activities related to the production and consumption of goods and services. Since earliest times, the primary function of organized society has been economic in nature.
The Pentagon is a large office building, with about 6,500,000 sq ft (600,000 m 2), of which 3,700,000 sq ft (340,000 m 2) are used as offices. Approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel work in the Pentagon. It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi (28.2 km) of corridors.
Beneath the Department of Defense are three subordinate military departments: the United States Department of the Army, the United States Department of the Navy, and the United States Department of the Air Force.dding to the total is over 1.1 million National Guardsmen and Reservists from the four services, bringing the total to just over 3.2 million employees. The Department of Defense is headed by the Secretary of Defense, a cabinet-level head who reports directly to the President of the United States.