The cost of Australia's role in the American-led "war on terror" and its own precautions against attacks at home is climbing towards A$30 billion ($36 billion) amid growing doubts of its value.
The Government remains committed to military operations in Afghanistan that have so far cost more than A$6 billion and says the threat of terrorism continues to justify measures that have accelerated in the past decade.
These include an enormous beefing-up of counter-terrorism laws and agencies - the domestic Australian Secret Intelligence Organisation has trebled in size - and security measures ranging from transport and infrastructure to business.
In Afghanistan - a commitment longer than the nation's war in Vietnam and opposed by most Australians - the human and financial toll has been rising. Australia first entered combat in Afghanistan with the US-led invasion in 2001, mainly with Special Forces units that were withdrawn the next year as the emphasis moved towards reconstruction. Combat and reconstruction forces returned in 2005 and have increased to about 1500 troops committed to remain until at least 2014, when under present planning most will be withdrawn. The war has killed 29 Diggers and injured 192.
Defence budget papers put spending on the war since 2001 at more than A$6 billion, rising from A$320 million in the first year of the conflict to a projected A$1.2 billion in 2011-12.