Members of the 28th Civil Engineer Squadron Explosive Ordnance Disposal Flight participate in the 50th Anniversary EOD Memorial Day ruck march at Ellsworth Air Force Base, S.D., May 4, 2018. National EOD Memorial Day is designated by Congress as the first Saturday of May to honor of EOD technicians who lost their lives while conducting operations across the globe. (U.S. Air Force photo by Airman 1st Class Nicolas Z. Erwin)