 In Vietnam he headed a team of 128 members of the Australian Assistance Group whose task it was to instruct South Vietnamese and Cambodian Troops before the ceasefire discussion were concluded.Geddes also had a long and influential career in military education at the Joint Services Staff College in Canberra, Scheyville OTU and has several achievement awards in his honour and also a number of military educational facilities named after him.The leadership training offered by the Officer Training Unit at Scheyville produced many strong and well-equipped leaders who used their skills during the Vietnam war and well after, two significant graduates who have gone on to influence the direction of the State and Nation are Jeff Kennet and Tim Fischer.