Secretary of the Air Force, Heather Wilson is accompanied by U.S. Representative, Greg Walden as Tech. Sgt. Tylor Strop shows them a wing spar from an F-15 Eagle, and explains how 173rd Fighter Wing maintainers wing have pioneered a method for inspecting the structure helping keep a fleet of 32 aircraft airworthy, Nov. 3, 2018. The method proved so innovative that the Air Force adopted it across the entire fleet of F-15s in the inventory. (U.S. Air National Guard photo by Staff Sgt. Riley Johnson)