I saw your advert in the paper <a href=" http://www.memories-book.co.uk/blog/form-of-research-paper/#upon ">essay on importance of school uniform</a> U.S. officials insist that a security agreement is in bothcountries' interest but say the Obama administration is notbluffing about resorting to the "zero option" - as it did inIraq two years ago - if any residual American troops are notgranted immunity from Afghan prosecution.