Joining the Royal Engineers on 1 November 1915, Geoffrey Herbert Hooper served as a Bristol Fighter pilot after transferring to the Royal Flying Corps in August 1916 and received Royal Aero Club Aviator's Certificate 3846 on 14 November 1916. Posted to 11 Squadron on 12 April 1917, he and his observers scored three victories during the summer of 1917. Following a rest and instructor duty with 38 Training Squadron, Hooper was reassigned to 20 Squadron on 14 September 1918. By the end of the month, he and his observer claimed six Fokker D.VIIs. He scored his final victory the following month on the morning of 10 November 1918, downing his seventh Fokker D.VII near Charleroi. Hooper later served with the Royal Australian Air Force.
Military Cross (MC)
2nd Lt. (T./Capt.) Geoffrey Herbert Hooper, R.E., attd. R.F.C.
For conspicuous gallantry and devotion to duty. When leading a patrol of four machines, he attacked ten enemy aircraft; during the engagement five of them were destroyed, two by himself. He had previously led a very successful night bombing attack on an aerodrome, in unfavourable weather, dropping bombs from a very low altitude, and doing a great amount of damage. He has invariably displayed great gallantry and skill when engaged in aerial combats.