U.S. Air Force Airmen from the 21st Civil Engineer Squadron complete exercised during a memorial ruck in remembrance of Airman 1st Class Matthew Seidler, at Peterson Space Force Base, Colorado, May 6, 2022. The 21st CES Explosive Ordinance Disposal Flight holds a memorial event three times a year: On Seidler’s birthday, the day he was killed and Memorial Day. (U.S. Space Force photo by Airman 1st Class Brooke Wise)