Commands composed of forces from two or more services, has a broad and continuing mission and is normally organized on a geographical basis. The number of unified combatant commands is not fixed by law or regulation and may vary from time to time.

Responsible for U.S. security interests in 25 nations that stretch from the Horn of Africa through the Arabian Gulf region, into Central Asia.

Responsible for all U.S. Army, Navy, Air Force, Marine Corps and Special Forces activities in more than 13 million square miles of Europe, Africa and the Middle East.

Oversees military operations in the North Atlantic geographic area and supports the other commanders-in-chief in their geographic regions around the world.

Plans, organizes, and executes homeland defense and civil support missions.

Promotes peace, deters aggression, responds to crises and, if necessary, will fight and win to advance security and stability throughout the Asia-Pacific region.

Responsible for all U.S. military activities in South America and Central America. Encompasses nineteen countries, represents about one-sixth of the world's land mass and covers about seven million square miles, stretching 6,000 miles from Mexico's southern border to Cape Horn.

SOCOM is the unified command for the worldwide use of Special Operations elements of the Army, Navy, Air Forces and Marine Corps.

STRATCOM deters military attack on the United States and its allies, and should deterrence fail, employs forces to achieve national objectives.

TRANSCOM ensures timely, customer-focused global mobility in peace and war with efficient, effective and integrated transportation from origin to destination. Scott Air Force Base, IL.