Full text of the resignation letter of the most senior US diplomat to resign 
over the US war on Afghanistan ...

http://www.washingtonpost.com/wp-srv/hp/ssi/wpc/ResignationLetter.pdf

"I have lost understanding of and confidence in the strategic purposes of 
the United States' presence in Afghanistan. I have doubts and reservations 
about our current strategy and planned future strategy, but my resignation 
is based not upon how we are pursuing this war, but why and to what end".