TheAustralian has a couple of interviews with SASR veteran Peter Tinley who says;

The Government had broken a "moral contract" with the defence force in sending it to an "immoral" war. "The Government has failed to be honest with the Australian people and you can't separate the defence force from the people. The reality is that it is made up of men and women from all over this country.
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The recent announcement of Australia sending the SASR to Afghanistan along with a Provincial Reconstruction Team points to the unfocused nature of Australia's involvement in the American led "War on Terror". The Howard government chose to join the United States pursuit of terrorism as a military issue. This is in part due to the "Great and Powerful Friends" (GAPF) doctrine of foreign policy that the Liberal Party adheres to. But equally influential on our policy toward Afghanistan has been the weak manner in which Australia has contributed. We are not in control of the outcome, and consequentially the Howard government is just floating along with no focus, and no possible means to take the expeditions in Afghanistan and Iraq to any conclusion. Australia needs to return to the policy of December 2001, pull out of Iraq, and focus its full energies on defeating Al Queda and the Taliban in Afghanistan. (more)

In 2001 Australian policy was that Australian forces were in Afghanistan for the "War on Terror", not for "Afghanistan", meaning Australia was not there for nation building. As a consequence Australia sent the very tip of its land based spear. The very effective Special Air Services Regiment (SASR). The SASR is trained to be highly independent and conduct extended operations, behind enemy lines, and without resupply for a week or longer.

John Howard recently announced that the SASR will be heading back to Afghanistan for a twelve month tour. This was met by many in Australia with a sigh of relief that we would be sending "more troops" to help out. But the SASR isn't for civil order, or police work. They are not infantry, they are for discovering and destruction of enemy forces. From what I can glean from different news reports, it seems the US may be winding down its special forces operations in Afghanistan. The British are also preparing to send five thousand of their infantry to Afghanistan, with the British SAS and Australian SAS preparing the way for them. The final reason is that there has been a resurgence of Al Queda and Taliban fighters, especially in, near, or on the Pakistan border. (more)
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.