English: Test facility craftsman Jack Culpepper adjusts a model of the F-15 Eagle before it undergoes aerodynamic testing in the mid-1970s in the 4-foot transonic wind tunnel at Arnold Air Force Base, Tennessee, headquarters of Arnold Engineering Development Complex. The Air Force recently celebrated the 50th anniversary of the F-15’s deployment. Models of the aircraft, engines and other F-15 components have frequently been tested by AEDC over the past 50 years.
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Test facility craftsman Jack Culpepper adjusts a model of the F-15 Eagle before it undergoes aerodynamic testing in the mid-1970s in the 4-foot transonic wind tunnel at Arnold Air Force Base, Tennessee