Boucher was born on 26 October 1898, the son of Lieutenant Colonel C. H. Boucher. He was educated at Wellington College from 1912 to 1915, after which he attended Wellington Cadet College in India. Boucher was
commissioned into the Unattached List for the Indian Army on 14 November 1916 and was appointed to the Indian Army on 1 December, attached to
2nd King Edward VII's Own Gurkha Rifles (The Sirmoor Rifles) although he was later to transfer to the
3rd Queen Alexandra's Own Gurkha Rifles in 1919. He was promoted to
lieutenant on 14 November 1917 and saw service against the Marris in India from 1 March to 8 April 1918, then saw service in Palestine in October 1918. After the war he returned to India and saw action on the North West Frontier in Waziristan during the period 1919–21 and 1921–24. He was
Mentioned in Despatches. Boucher attended the Staff College, Camberley from 1931 to 1932. In April 1933 he was appointed a General Staff Officer Grade III. In November 1934 he relinquished the staff post and was promoted to major to take up a field appointment as a brigade major. In 1936 for "distinguished services rendered in the field in connection with the Mohmand Operations, North West Frontier of India, during the period 15th/16th August to 15th/16th October 1935" he was awarded the
Distinguished Service Order (DSO). He was appointed an instructor at the
Staff College, Quetta from 21 January 1938 to 21 September 1940 with the local rank of lieutenant colonel. ==Second World War==