Military requirements in Afghanistan are decided by the North Atlantic Treaty Organisation (NATO) and laid out in the Combined Joint Statement of Requirement. Despite the recent increases in commitment made by many of our allies there remain shortfalls in some areas such as training and mentoring teams, combat troops, in the south and east, and support helicopters. The UK continues to work with partners to address these shortfalls.
Information on national contributions can be found on the Foreign and Commonwealth Office, the Ministry of Defence and NATO websites:
http://www.fco.gov.uk/en/fco-in-action/uk-in-afghanistan/
http://www.mod.uk/DefenceIntemet/DefenceNews/InDepth/OperationsInAfghanistan.html
http://www.nato.int/isaf/index.html