Conversation so far:
who is the highest ranking general in the us army today
The 40th and current Chief of Staff of the Army is General James C. McConville.
what is the role of chief of staff of the army
As the most senior uniformed officer serving in the Department of the Army, the Chief of Staff of the Army is the principal military advisor,
what other role does chief of staff of the army have besides being the principal military advisor serving the department of the army
The Chief of Staff of the Army is deputy to the Secretary of the Army.

Question: when was the position formed
Self-contained rewrite: when was the chief of staff of the army position formed