Lt. Col. Curtis Dougherty participates in a memorial run May 24, 2018, at Luke Air Force Base, Ariz. The run was in memory of a fallen Thunderbird pilot who lost his life in a crash in the Nevada desert outside of Las Vegas, April 4. The length of the run was 4 kilometers in honor of Maj. Stephen Del Bagno who was known as Thunderbird 4. (U.S. Air Force photo by Airman 1st Class Aspen Reid)