Senior Airman Zachary McCarthy, an explosive ordnance disposal technician assigned to the 28th Civil Engineer Squadron, takes notes on Staff Sgt. Robert Schmid, an EOD technician assigned to the 28th CES, while Schmid measures the dimensions of an unexploded ordnance during an EOD Team of the Year competition at Ellsworth Air Force Base, S.D., Sept. 12, 2017. This scenario during the event had teams inspect different ordnances to determine the make and model of the explosives. (U.S. Air Force photo by Airman Nicolas Z. Erwin)