According to Michael D. Griffin, the undersecretary of defense for research and engineering, among the many outstanding achievements of DoD engineers include the creation of the Global Positioning System and the mass manufacture of penicillin.
The Department of Defense is in charge of providing the armed forces required to prevent conflict and safeguard national security.
With over 1.3 million men and women on active duty, the Army, Navy, Marine Corps, and Air Force make up the bulk of these forces.
In an amendment to the original 1947 statute, the National Military Establishment was renamed the "Department of Defense" on August 10, 1949, and it incorporated the three cabinet-level military departments.
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