United States Secretary of Defense 美国国防部部长
（重定向自SECDEF）
The Secretary of Defense (SecDef) is the leader and chief executive officer of the Department of Defense, an Executive Department of the Government of the United States of America. The Secretary of Defense's power over the United States military is second only to that of the President. This position corresponds to what is generally known as a Defense Minister in many other countries. The Secretary of Defense is appointed by the President with the advice and consent of the Senate, and is by custom a member of the Cabinet and by law a member of the National Security Council.