Master Sgt. Carlos Sanchez, 28th Civil Engineer Explosive Ordnance Disposal flight lead, performs one of 32 burpees during the 50th Anniversary EOD Memorial Day ruck march at Ellsworth Air Force Base, S.D., May 4, 2018. The 32 repetitions of the exercises represent the 32 fallen EOD Airmen who have been killed in the line of duty since 9/11. (U.S. Air Force photo by Airman 1st Class Nicolas Z. Erwin)