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Maintenance crews from the California and Alabama Air National Guard replace an Air Data Controller on an F-16 during SAFE SKIES 2011. The Air National Guard is in Ukraine supporting SAFE SKIES 2011, a 2-week multinational flying event preparing Ukraine and Poland to better protect their airspace during the 2012 EUROPCUP. (U.S. Air Force Photo by Tech. Sgt. Charles Vaughn, 144 FW/PA / Released)

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