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Why was Colonel Billy Mitchell court-martialed and thrown out of the U.S. Army?

Verified Answer :

He was court-martialed on the charges of insubordination and
insisted that the Navy should build aircraft carriers rather than
battleships.  He believed that these new
vessels would be vital when war would occur.
In a way he was proven correct in World War II when aircraft carriers
were instrumental in many victories at sea.