Petraeus faces Afghan conundrumConflicting interests and visions await US and Nato forces commander in Afghanistan.
Petraeus urges unity in Afghan warNew US commander says forces will remain committed to minimising civilian deaths.
General Petraeus sets out missionUS commander says all parties involved need to co-operate better in Afghanistan.
McChrystal announces retirementSacked commander of US and Nato forces in Afghanistan tells army he is retiring.