Refueling lifeline of U.S., NATO air ops
                Chief Master Sgt. Christopher Powell guides a KC-135 Stratotanker boom pod as a Royal Danish air force pilot positions a F-16 Fighting Falcon to take on fuel in the skies above Denmark Dec. 8, 2009. The Danish F-16 was one of 30 performing their semi-annual aerial refueling training. Chief Powell is a 100th Operations Group boom operator. (U.S. Air Force photo/Tech. Sgt. Kevin Wallace)
                
                    
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