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A U.S. Air Force F-16 Fighting Falcon fighter aircraft assigned to the 18th Aggressor Squadron takes off from Eielson Air Force Base, Alaska, Oct. 6, 2014, during RED FLAG-Alaska 15-1. RF-A is a series of Pacific Air Forces commander-directed field training exercises for U.S. and partner nation forces, providing combined offensive counter-air, interdiction, close air support and large force employment training in a simulated combat environment. (U.S. Air Force photo by Tech. Sgt. Joseph Swafford Jr./Released)

US Marines walk in their camp as smokes and dust rise from a controlled explosion near the US military base Camp Leatherneck in Afghanistan’s Helmand Province on May 29, 2011. There are currently around 130,000 international troops, around two-thirds from the United States, stationed in Afghanistan. ( MASSOUD HOSSAINI/AFP/Getty Images)