Description:All is quiet at Pakistan's Shamsi airbase Sunday, following Islamabad's demand that America leaves the remote station used for drone flights. Washington is treading lightly to avoid aggravating an already fragile relationship that was badly bruised by a NATO attack on a Pakistani military outpost last month that killed 24 Pakistani soldiers. Pakistan demanded the U.S quit the airbase and blocked ground supply routes through Pakistan to U.S. forces in Afghanistan.(1:36)