Larry Stratton, Boeing Company B-1 structural analysis engineer, inspects rivet holes for doubling straps during a B-1 structural modification at Ellsworth Air Force Base, S.D., Aug. 6, 2013. By adding this new modification the B-1 will not only be more aerodynamic in flight, but the doubling straps will also strengthen the backbone of the aircraft. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)
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