Fight that changed boxing, one event in a year that changed so much more. We begin tonight with what could be a major change for u. S. Troops in afghanistan. Today president obama ordered the pentagon to prepare for a full u. S. Troop withdrawal by the end of the year. Its a decision that could affect the lives of 10s of thousands of americans families. Now, a few thousand u. S. Troops were sent to afghanistan not long after 9 11, by 2005, the numbers swelled to 20,000. The american presence piqued threpeakedthree year old ago, bt president obama has been pulling americans out of the country since then now about 35,000 u. S. Forces in afghanistan. The president spoke with afghan President Hamid karzai today and the white house acknowledged if afghanistan does not sign a Security Agreement with the u. S. That american troops will leave by the end of the near, Patty Culhane reports. Reporter u. S. President obama has left the negotiationing with hamid karzai to his staffer. But after nin