Education
Royal Military Academy Sandhurst. Royal Military College, Sandhurst.
Royal Military Academy Sandhurst. Royal Military College, Sandhurst.
Educated at Elizabeth College and the Royal Military College, Sandhurst, Caldwell was commissioned into the Royal Engineers in 1940 during the Second World War. He also served in Malaya during the Malayan Emergency in the rank of major. He appointed Director of Defence Operational Plans at the Ministry of Defence in 1970 and Assistant Chief of the General Staff (Operational Requirements) in 1972 before retiring in 1974.
He died on 22 November 2014.