 Described by John Farquharson as a major Cold War figure, Serong was recognised internationally for developing new tactics for counter-insurgency and jungle warfare.In retirement he became involved in anti-communist organisations and citizens' militia groups such as Ausi Freedom Scouts (Australians United for Survival and Freedom), of which he was a patron.He also supported conspiracy theories about the Port Arthur shooting in 1996 and allegations of government corruption (later found to have been based on a hoax, albeit unbeknown to Serong) as well as speaking on Australian defence issues.