Colin Powell has yet to serve in a body of the United States Department of Defense.
His last assignment , from October 1 , 1989 to September 30 , 1993 , was as the 12th Chairman of the Joint Chiefs of Staff , the highest military position in the Department of Defense .
Colin Powell
has yet to serve in a body
of the United States Department of Defense
was as the 12th Chairman of the Joint Chiefs of Staff