Air Force Tech. Sgt. Christopher Dial, left, and Staff Sgt. Christopher Graham, 337th Test and Evaluation Squadron B-1 avionics technicians, at Nellis Air Force Base, Nev., June 14, 2017. The 337th TES spent time at Nelllis AFB conducting operational testing on Sustainment Block 17 with students and instructors at the Air Force Weapons School.

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