SSgt. David Martindale gets ready to work on a training problem at Eglin Air Force Base, Fla., Jul. 19, 2012. F-35 maintenance training is conducted by the 372nd Training Squadron Detachment 19, part of the 982nd Training Group at Sheppard Air Force Base, Texas. Martindale is an F-35 maintenance student with the 31st Test and Evaluations Squadron.
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