** FILE ** A U.S. Air Force F-16 jet fighter from the 31st Fighter Wing lands at NATO's Aviano Air Base in Aviano, Italy, on Friday, March 25, 2011. (AP Photo/Luca Bruno)

Photo by: Luca Bruno

** FILE ** A U.S. Air Force F-16 jet fighter from the 31st Fighter Wing lands at NATO's Aviano Air Base in Aviano, Italy, on Friday, March 25, 2011. (AP Photo/Luca Bruno)