Daniel Weimer, 436th Maintenance Squadron aircraft jet engine technician supervisor, right, shows Clifford Jaffray, left, how to shut down the last General Electric TF39 engine to be tested in the Test Cell, March 25, 2016, on Dover Air Force Base, Del. In 1971, as a qualified operator, Jaffray was the first person to run a TF39 in the test cell along with Weimer and other Test Cell personnel. ( Air Force photo/Roland Balik)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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