Canadian Snowbirds pilots start their jet engines in preparation for their aerial demonstration during the 2009 Airpower Over the Midwest Air Show at Scott Air Force Base,Ill., on Sept. 19, 2009. Their pilots and technicians work as a team to bring thrilling performances to the North American public. Serving as Canadian ambassadors, the Snowbirds demonstrate the high level of professionalism, teamwork, excellence, discipline and dedication inherent in the women and men of the Air Force and the Canadian forces. (U.S. Air Force Photo/Master Sgt. Dave DeRemer)