Definition of Joint Chiefs of Staff noun from the Oxford Advanced Learner's Dictionary

 

Joint Chiefs of Staff

 noun
noun
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[plural]
 
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(in the US) the leaders of the armed forces who advise the President on military matters Culture The Joint Chiefs of Staff form a US government committee which includes the Chiefs of Staff of the US Army, Navy and Air Force, the Commandant of the US Marine Corps, and the Chief of the National Guard Bureau. It was established in 1942 and advises the US President, the National Security Council and the Secretary of Defense. In 1989, General Colin Powell became the first African American to be the committee's chairperson (= person in charge of meetings).
See the Oxford Advanced American Dictionary entry: Joint Chiefs of Staff