Of these about 90,000 are US troops. US Defence Secretary Leon Panetta said in February that Washington wanted to carry on winding down combat operations in Afghanistan during 2013, more than a year before the deadline for complete withdrawal. The lion's share of the troops come from the US. The remainder are from some 50 other countries including the UK, France, Germany, Italy, Canada, Australia, Poland and Turkey. In April 2012 Australia announced that it would be withdrawing most of its force of about 1,550 troops - based mainly in the Uruzgan region - earlier than originally planned - before Australian elections are held in 2013. Leaders of nations contributing forces in Afghanistan have been talking about withdrawal for some time. Britain, the second largest contributor to Nato's Afghanistan operation, has about 9,500 troops in Afghanistan. It says that it wants them to leave by the end of 2014, but that hundreds of its soldiers may stay on after it pulls out to support and train Afghan forces. France announced in February 2012 that it wanted to bring home 1,000 of its soldiers before the end of the year, leaving only a few hundred after 2013. France currently has about 3,600 soldiers in Afghanistan. Germany, which has about 4,500 troops in the country, say that it wants them all of them out at the earliest opportunity. How successful has the Isaf operation been? It depends. The UK's Prime Minister Cameron said in March 2012 that the reason his troops were