The U.S. Air Force Thunderbirds fly over NASA's Kennedy Space Center in commemoration of NASA's 50th anniversary.

The U.S. Air Force Thunderbirds fly over NASA's Kennedy Space Center in commemoration of NASA's 50th anniversary. The aircraft had flown earlier to support the Daytona 500, also celebrating its 50th anniversary, and chose to fly over Kennedy on their way to their next assignment. Below them is space shuttle Endeavour, waiting to launch on the STS-123 mission targeted for March 11. Photo credit: NASA/Jack Pfaller