An F-16, below, escorts two F-35 jets, above, after arriving at it new operational base Wednesday, Sept. 2, 2015, at Hill Air Force Base, in northern Utah. Two F-35 jets touched down Wednesday afternoon at the base, about 20 miles north of Salt Lake City. A total of 72 of the fighter jets and their pilots will be permanently based in Utah. The Air Force says the F-35s are replacing the older F-16 with greater speed and combat range and lower maintenance costs due to a computerized self-test system.(AP Photo/Rick Bowmer)
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