A-10 East Demonstration crew chiefs, Staff Sgts David Clifford and Robert Lundsford, walk off after their A-10 Thunderbolt has taken off for a demonstration performance at the 2010 Singapore Airshow held in Changi, Singapore, Feb. 4. The Trade and Airshow runs from Feb 2-7 with the first four days being focused on sales and the last two days focused on displays for the public.