Conversation so far:
What happened in Claude Auchinleck's life between the world wars?
Auchinleck attended the Staff College, Quetta between 1920 and 1921.
What was Claude Auchinleck's greatest accomplishment between world wars?
In 1938 Auchinleck was appointed to chair a committee to consider the modernisation, composition and re-equipment of the British Indian Army
How long was Claude Auchinleck appointed to Chair?

Question: What was his greatest accomplishment?
Self-contained rewrite: What was Claude Auchinleck's greatest accomplishment between world wars?