The Conservatives are not in power how can they pull out and in reality the Conservatives are more likely to support the troops than Labour in the long term.
If you are referring to Cameron's speech at the Conservative Party Conference I was more surprised in how he was inferring that they would support the troops even more in Afganistan so I am not sure what you are getting at.
We probably will not have an election for another 3 or 4 years at least so a lot can change in that time.
Conservative Party's position on Afganistan - does not sound like wanting to pull out to me
http://www.conservatives.com/tile.do?def=conference.2006.news.story.page&obj_id=132648